Brain, Vol. 122, No. 1, 17-26,
January 1999
© 1999 Oxford University Press
Cortical lesions in multiple sclerosis
1 The National Hospital for Neurology and Neurosurgery, London, UK, 2 Department of Radiology, Academic Hospital of the Vrije Universiteit, Amsterdam, The Netherlands and 3 Neuropathology Department, the Queen's University of Belfast, Northern Ireland
Correspondence to:
Dr Tamas Revesz, Neuropathology Department, Institute of Neurology, Queen Square, London WC1N 3BG, UK
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Abstract |
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Although previous studies have shown that the lesions of multiple sclerosis may involve the cerebral cortex, there is little published research on the prevalence and distribution of such lesions. Using neuropathological techniques and MRI, a series of studies has been undertaken in order to assess this, in particular to identify their relationship to cortical veins. A serial MRI study showed that the use of gadolinium proffered an increase in cortical lesion detection of 140% and showed that 26% of active lesions arose within or adjacent to the cortex. In a post-mortem study, MRI under-reported lesions subsequently analysed neuropathologically, particularly those arising within the cortex. In a further 12 cases examined, 478 cortical lesions were identified, of which 372 also involved the subcortical white matter. Seven different lesion types were identified; the majority arose within the territory of the principal cortical veins, whilst the remaining quarter arose within the territory of the small branch or superficial veins. Small cortical lesions are common in multiple sclerosis and are under-reported by MRI. Investigation of the cortical venous supply shows how such lesions may arise, and why the majority also involve the underlying white matter.
multiple sclerosis; cortical lesions; neuropathology; MRI
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Introduction |
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The lesions of multiple sclerosis typically arise within the optic nerves, spinal cord, brainstem and the periventricular white matter of the cerebral hemispheres. These are readily detected in vivo by means of MRI which has greatly improved diagnostic accuracy in this disorder and through research which has increased understanding of the pathophysiology of the disease. Recent MRI studies using the paramagnetic agent gadolinium, which, by virtue of enhancement of the process of longitudinal relaxation, shows up lesions associated with inflammation and breakdown of the blood–brain barrier (Kermode et al., 1990
), have shown that lesions also arise within grey matter structures, particularly the cortex. Using conventional MRI sequences cortical lesions are less likely to be visible on T2-weighted images than those in white matter; this is in part due to grey matter lesions having longer relaxation times than those of normal white matter which results in poor contrast resolution between grey matter and lesions in the cortex compared with lesions and white matter. Partial volume effects with surrounding CSF outside the cortex also play a role, but it is likely that differences in the cellular density of cortical lesions compared with white matter lesions may be most important; high cellular density may not allow a sufficient expansion of the extracellular space to allow an increase in relaxation times in cortical lesions, as is seen in those arising in white matter. It is known that lesions may involve the cortex, although there is little research published which has set out to identify their nature and pathogenesis, and their clinical significance. Brownell and Hughes (1962) in a series of 32 cases found that 26% of all hemisphere lesions were found outside the white matter, with 17% at the leucocortical junction, 4% in the central grey matter and 5% within the cortex itself. Lumsden (1970) in his study of 60 cases found that 93% of cases showed involvement of the cortex to a varying degree with some cases showing only a few cortical lesions, whilst in one case there were 465 gyral plaques. In 10 of the cases, 290 lesions (59% of all hemisphere lesions) were seen to involve the cortex. Both studies showed that lesions involving the cortex were sited predominately at the leucocortical junction.
The vascular supply of the cerebral cortex is made up of branches of cerebral arteries which form a network within the pia before penetrating the cortex to supply it and the underlying white matter (Graham, 1992). Studies have shown that the cortex may be divided into four cortical vascular regions (De Reuck, 1972; Duvernoy et al., 1981). The first region lies within the molecular layer (layer I) of the cortex; Ia is devoid of capillaries and crossed by arterial and venous trunks, Ib contains a vascular network whose vessels run perpendicular to the cortical surface. These vessels also supply layer II, the external granular layer. The second cortical vascular region lies within the superficial pyramidal layer (IIIa and IIIb) and is made up of palisades of vessels running perpendicular to the cortical surface. The third region is the most densely vascularized part of the cortex and lies within the deep pyramidal layer (layer IIIc), the internal granular layer (layer IV) and part of the ganglionic layer (layer Va), forming a dense meshwork of venous branches. The fourth region lies within the deep cortical structures (layers Vb and VI) and is less densely packed with vessels but continuous with the deep, long branching principal veins which pass through these layers parallel to the cortical surface. Studying cortical vessels following injection of Indian ink and gelatin and low viscosity resin, Duvernoy and co-workers were able to distinguish six different types of cortical artery and five types of cortical vein (Duvernoy et al., 1981) (Figs 1–7, this paper). The principal vein (V5) passes through the cortex to the white matter. Its territory forms a conical shape whose base lies at the leucocortical junction. The largest purely intracortical vein (V4) drains all six cortical layers, and V3–V1 drain progressively more superficial regions of the cortex.
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We have undertaken a series of studies using neuropathological techniques and MRI which set out to assess (i) the frequency with which cortical lesions arise in vivo by means of T1-weighted MRI and the sensitivity with which they are detected by MRI by means of a comparison with neuropathological examination; (ii) the characteristics of cortical lesions in a series of post-mortem specimens and their relationship to other white matter lesions subjacent to the cortex; and (iii) how cortical lesions arise using knowledge about the venous supply of this region of the hemisphere. A greater understanding of the nature of cortical lesions may allow an increase in understanding of the involvement of the cortex in the pathogenesis of cognitive and other deficits in multiple sclerosis.
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Methods |
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In vivo MRI study
Twenty-five patients (mean age 31.7 ± 6.6 years) with clinically definite multiple sclerosis (Poser et al., 1983
) attending the Neurological Outpatient Department of the Academic Hospital of the Free University of Amsterdam underwent serial MRI examinations at monthly intervals. Seventeen had relapsing–remitting multiple sclerosis and eight had a secondary progressive course. The median disease duration was 6 (range 1–24) years, the median EDSS (expanded disability status scale) was 3.0 (range 1.0–6.0). Imaging was undertaken on a 0.6 Tesla system with a standard head coil and a multi-slice spin echo technique, giving rise to T2-weighted images [TR (repetition time) 2755 ms, TE (echo time) 60 and 120 ms] with two excitations, and gadolinium enhanced T1-weighted images (TR 400 ms, TE 28 ms, four excitations). The slice thickness was 5 mm (gap 1.25 mm) and the in-plane resolution was 1 x 1.3 mm. The performance of the scanner was stable throughout the study period. The number and location of enhancing lesions were noted by F.B. and P.R.A., and also whether or not enhancing lesions showed any accompanying change in signal intensity on T2-weighted images. The patients gave informed consent to participate in the MRI studies which were approved by the Ethics Committee of the Free University, Amsterdam.
Post-mortem MRI—neuropathology study
Two formalin fixed brains of patients from the multiple sclerosis brain bank of the Queen's University of Belfast Neuropathology Department from cases of clinically definite multiple sclerosis were examined. Coronal whole brain slices were cut at 1 cm thickness. Brain slices were scanned individually with a standard 7.5 inch surface receiver coil on the same 0.6 T system used in the in vivo study. A spin echo pulse sequence was employed (TR 2000 ms, TE 48 and 96 ms, two excitations) with a slice thickness of 5 mm and an in-plane resolution of 0.5 x 0.5 mm. The post-mortem images were analysed on a SUN Sparc2 workstation using home programmed software operating under OpenwindowsTM. Each lesion was identified on the T2-weighted image, and the area of the lesion calculated using an interactively established signal intensity threshold. Lesions were classified as being cortical, juxtacortical (within the white matter subjacent to the cortex) or periventricular.
The individual slices of one of the brains were recorded as a binary image using a Leitz TAS Plus image analyser, then carefully dissected into tissue blocks for paraffin-embedded histological investigation. Each block was labelled and recorded on a hard copy binary map for subsequent two-dimensional reconstruction. Blocks were processed and embedded in paraffin wax and 5 µm sections were stained with luxol fast blue, and counterstained with haematoxylin and eosin. Each section was examined on a Leitz orthoplan microscope using a x10 planapo bright field objective, and lesions were manually mapped on to the appropriate binary image. Individual lesions on each slice were recorded as white matter, cortical or juxtacortical.
Neuropathological study
Previously cut hemisphere sections from 12 brains held at the Neuropathology Department of the Institute of Neurology of patients who had suffered from multiple sclerosis were studied. The medical notes had been scrutinized by one of us (D.K.) in order to verify the diagnosis on clinical grounds. The material had been fixed in buffered formalin and embedded in celloidin or paraffin wax. Large whole brain sections in the coronal plane or smaller regions in which cortex was included, which had been stained with haematoxylin and eosin, luxol fast blue–cresyl violet, Heidenhain's myelin stain and phosphotungstic acid haematoxylin, were viewed.
Cortical lesions were defined as sharply demarcated demyelinated areas with relative preservation of both axons and neurons with or without an accompanying inflammatory cell infiltration. These were identified and counted by TR and DK. It soon became clear that cortical lesions showed a distinctive pattern, shown in
Figs
1–7
. Each lesion was typed according to this pattern. An assessment of the extent of infiltration of mononuclear inflammatory cells and the degree of cellularity both within and at the edge of each lesion in which there was white matter involvement was attempted according to methods previously published (Revesz et al., 1994). This was not possible in the case of lesions which involved cortex only owing to their normal high cellular background.
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Results |
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In vivo MRI study
A total of 172 scans was performed (median per patient 5, range 1–14). Two hundred and fifty-eight enhancing lesions were seen (median per patient 2, range 0–8). There were 41 enhancing cortical lesions (Fig. 8A
) (median per patient 0, range 0–15), of which 29 (70%) were seen on the corresponding T2-weighted image (Fig. 8B). Twenty-seven enhancing lesions were seen adjacent to the cortex, of which 24 (89%) were seen on the T2-weighted scans. One hundred and ninety enhancing lesions were seen elsewhere in the white matter, of which 187 (98%) were seen on corresponding T2-weighted scans. The difference between lesion count using gadolinium and that using T2-weighted images was significant (
2 = 41.16, P < 0.001).
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Post-mortem MRI—neuropathology study
The post-mortem images, having improved signal-to-noise ratio (owing to the use of a surface coil) and an absence of motion artefact, showed higher resolution. Both brains showed characteristic high signal intensity lesions most marked in the periventricular regions and centrum semi-ovale, but also in the cortices (Fig. 9A
). Case I showed 66 white matter lesions, of which 8 (12%) were adjacent to the cortex. In case II, 134 white matter lesions were seen, of which 58 (43%) were juxtacortical and 2 (1.5%) were purely intracortical.
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Histological examination of case II revealed 328 lesions, of which 14 (4.3%) were cortical, 108 were juxtacortical (32.9%) and 206 elsewhere in the white matter (62.8%) (Fig. 9B
).
Neuropathological study
An average of 4 (range 2–6) coronal slices was inspected per brain. A total of 478 cortical lesions was identified. Three hundred and seventy-two (76%) showed involvement of the subcortical white matter, 106 (24%) arose exclusively within the cortex. Lesion type 1 accounted for the majority (210 lesions, 44%) of lesions (Fig. 10). Lesions occurred with equal frequency within gyri and within sulcal cortex, although sulcal lesions when present showed a tendency to arise at the deepest point of the sulcus. Neither the distribution nor the microscopic features of these lesions suggested an ischaemic aetiology.
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Portions of lesion involving the cortex showed a tendency not to be inflamed, although since the cortex is in general a much more cellular structure it is more difficult to assess this accurately without recourse to modern immunohistochemical preparations. Similarly it was difficult to judge axon or neuronal loss within the intracortical part of the lesion.
Those parts of the lesion within the white matter were no different to those arising elsewhere within the white matter; 200 lesions (53.7%) showed evidence of inflammation, 160 showed a cellular infiltrate (43%), 76 lesions showed edge activity (20.4%).
Comparison of the characteristics of cortical lesions with those of cortical veins seen in Duvernoy's study shows clearly that the majority of lesions arise within the territory of the principal vein V5—types 1, 4 and 5 (277 lesions, 57.9%); the central vein of the gyrus—type 7 (99 lesions, 20.7%); or V4—types 2 and 6 (77 lesions, 16.1%). Type 6 may also reflect involvement of small branch veins (2.5%) and type 3 superficial veins (V1 and V2) alone or proximal segments of V4 and V5 (3.6%).
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Discussion |
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This multifaceted study set out to investigate the prevalence and characteristics of cortical lesions in multiple sclerosis. The MRI data provide important information; it is clear that T2-weighted images cannot show cortical lesions well; reasons for this have been noted in the introduction. Even when high resolution images of post-mortem specimens are examined, the numbers of cortical lesions identified are considerably less than when the section is examined histologically. There is some evidence that the use of the alternative imaging sequence FLAIR (fast fluid-attenuated inversion recovery) may improve lesion detection within the cortex (Rovaris et al., 1997
). This is because in this sequence CSF has zero signal, and grey matter and white matter have similar signal intensities, whereas the contrast between a T2-weighted image of a lesion and that of normal appearing cerebral tissue is much greater. Clearly, lesions smaller than the resolution of the MRI system will only be seen on a subsequent histological examination, and in addition MRI lesions may appear confluent when clearly distinct histopathologically. This explains the large disparity between the number of white matter lesions recorded using the different methods, although it should be noted that fixation alters the distribution of water within tissue, with the result that relaxation times may change, which may in turn affect contrast (Nagano et al., 1987).
The data from the serial study confirm previous reports that the use of gadolinium greatly increases the number of new cortical lesions seen (Barkhof, 1992; Miller et al., 1993; Barkhof et al., 1997). The use of gadolinium in our series proffered an increase in lesion visibility of 140%.
We have shown that the majority of lesions are likely to arise within the juxtacortical white matter and cortex. Such lesions appear histologically to be no different to those arising elsewhere within the white matter. Others clearly arise within the cortex itself—types 2, 3, 6 and 7 (24% of lesions). Particularly prevalent was type 7 which arose within the cortical ribbon around the central vein of the gyrus.
Using knowledge of cortical venous architecture acquired by de Reuck (1972) and Duvernoy et al. (1981), we have been able to show that there is a clear relationship between the site and characteristics of cortical lesions and the five different types of cortical vein, just as Dawson's `fingers' arise adjacent to veins in periventricular white matter. Large lesions which occupy the majority of the cortex with extensive subcortical involvement and predominately subcortical lesions are likely to arise as a result of involvement of the principal vein (V5). Large type 7 lesions which pass around gyri are likely to reflect involvement of the central vein of the gyrus or a series of principal veins lying perpendicular to the gyral surface. Smaller intracortical lesions, such as types 3 or 6, may arise as a result of involvement of small branch veins or V1 and V2 (Figs 1 and 3).
Turning now to the clinical relevance of these lesions, truly cortical clinical syndromes are rare; dysphasia, dyscalculia and cortical sensory loss were reported by McAlpine (1972). Kahana et al. (1971) and Poser (1978) found the incidence of aphasia to be 1% in their series. Alexia with agraphia (Day et al., 1987) and palinopsia (Jacome, 1985) have also been recorded. In those cases in which imaging has been reported it is clear that large subcortical lesions have been implicated. Seizures are also uncommon but series cite an incidence of 1–4% (Drake and MacKay, 1961; Matthews 1962, 1991). Early neuropathological studies identified an association between seizures and subcortical lesions (Drake and MacKay, 1961) and this has subsequently been shown in vivo in series with MRI (Ghezzi et al., 1990;
Thompson et al., 1994; Truyen et al., 1996).
Dysfunction of cognitive skills arises in 50% of patients (Ron et al., 1991); the commonest psychometric deficits are impairments of visual and verbal memory, naming ability and attention skills (Beatty et al., 1989; Rao et al., 1989; Ron et al., 1991) with a relative preservation of high level visuospatial and language functions. It is possible that the large number of plaques which arise in the subcortical white matter may well be responsible for the form of cognitive deficits known to arise in multiple sclerosis; however, studies have shown that there is no clear relationship between the site or extent of such MRI lesions and the nature and severity of cognitive impairment (Huber et al., 1987; Franklin et al., 1989; Rao et al., 1989; Ron et al., 1991; Foong et al., 1997), although one group of investigators (Damian et al., 1994) found an association between the number of subcortical lesions and cognitive impairment. No relationship has been found between the incidence or severity of cortical atrophy or ventricular size and cognitive impairments, but other studies have shown a relationship between atrophy of the corpus callosum and cognitive impairments (Huber et al., 1987; Rao et al., 1989; Pozzilli et al., 1991), an idea put forward by R. O. Barnard over 20 years ago (Barnard and Triggs, 1974). Lesions in the subcortical white matter may also provoke clinical deficits, but our studies suggest that cortical and subcortical lesions may not occur with sufficient frequency to render them clinically important.
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Received May 26, 1998. Revised August 13, 1998. Accepted September 7, 1998.
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S. Mesaros, M. A. Rocca, M. Absinta, A. Ghezzi, N. Milani, L. Moiola, P. Veggiotti, G. Comi, and M. Filippi Evidence of thalamic gray matter loss in pediatric multiple sclerosis Neurology, March 25, 2008; 70(13_Part_2): 1107 - 1112. [Abstract] [Full Text] [PDF]
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L. K. Fisniku, P. A. Brex, D. R. Altmann, K. A. Miszkiel, C. E. Benton, R. Lanyon, A. J. Thompson, and D. H. Miller Disability and T2 MRI lesions: a 20-year follow-up of patients with relapse onset of multiple sclerosis Brain, March 1, 2008; 131(3): 808 - 817. [Abstract] [Full Text] [PDF]
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A. H. Poonawalla, K. M. Hasan, R. K. Gupta, C. W. Ahn, F. Nelson, J. S. Wolinsky, and P. A. Narayana Diffusion-Tensor MR Imaging of Cortical Lesions in Multiple Sclerosis: Initial Findings Radiology, March 1, 2008; 246(3): 880 - 886. [Abstract] [Full Text] [PDF]
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H. Lassmann and C. F. Lucchinetti Cortical demyelination in CNS inflammatory demyelinating diseases Neurology, January 29, 2008; 70(5): 332 - 333. [Full Text] [PDF]
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N. M. Moll, A. M. Rietsch, A. J. Ransohoff, M. B. Cossoy, D. Huang, F. S. Eichler, B. D. Trapp, and R. M. Ransohoff Cortical demyelination in PML and MS: Similarities and differences Neurology, January 29, 2008; 70(5): 336 - 343. [Abstract] [Full Text] [PDF]
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F. Nelson, A.H. Poonawalla, P. Hou, F. Huang, J.S. Wolinsky, and P.A. Narayana Improved Identification of Intracortical Lesions in Multiple Sclerosis with Phase-Sensitive Inversion Recovery in Combination with Fast Double Inversion Recovery MR Imaging AJNR Am. J. Neuroradiol., October 1, 2007; 28(9): 1645 - 1649. [Abstract] [Full Text] [PDF]
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Z Khaleeli, J Sastre-Garriga, O Ciccarelli, D H Miller, and A J Thompson Magnetisation transfer ratio in the normal appearing white matter predicts progression of disability over 1 year in early primary progressive multiple sclerosis J. Neurol. Neurosurg. Psychiatry, October 1, 2007; 78(10): 1076 - 1082. [Abstract] [Full Text] [PDF]
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M. Calabrese, N. De Stefano, M. Atzori, V. Bernardi, I. Mattisi, L. Barachino, A. Morra, L. Rinaldi, C. Romualdi, P. Perini, et al. Detection of Cortical Inflammatory Lesions by Double Inversion Recovery Magnetic Resonance Imaging in Patients With Multiple Sclerosis Arch Neurol, October 1, 2007; 64(10): 1416 - 1422. [Abstract] [Full Text] [PDF]
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F. Agosta, E. Pagani, D. Caputo, and M. Filippi Associations Between Cervical Cord Gray Matter Damage and Disability in Patients With Multiple Sclerosis Arch Neurol, September 1, 2007; 64(9): 1302 - 1305. [Abstract] [Full Text] [PDF]
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M. P. Amato, E. Portaccio, B. Goretti, V. Zipoli, M. Battaglini, M. L. Bartolozzi, M. L. Stromillo, L. Guidi, G. Siracusa, S. Sorbi, et al. Association of Neocortical Volume Changes With Cognitive Deterioration in Relapsing-Remitting Multiple Sclerosis Arch Neurol, August 1, 2007; 64(8): 1157 - 1161. [Abstract] [Full Text] [PDF]
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F. Agosta, M. Absinta, M. P. Sormani, A. Ghezzi, A. Bertolotto, E. Montanari, G. Comi, and M. Filippi In vivo assessment of cervical cord damage in MS patients: a longitudinal diffusion tensor MRI study Brain, August 1, 2007; 130(8): 2211 - 2219. [Abstract] [Full Text] [PDF]
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R. Dutta and B. D. Trapp Pathogenesis of axonal and neuronal damage in multiple sclerosis Neurology, May 29, 2007; 68(22_suppl_3): S22 - S31. [Abstract] [Full Text] [PDF]
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R. Zivadinov Can imaging techniques measure neuroprotection and remyelination in multiple sclerosis? Neurology, May 29, 2007; 68(22_suppl_3): S72 - S82. [Abstract] [Full Text] [PDF]
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B. Audoin, G. Davies, W. Rashid, L. Fisniku, A.J. Thompson, and D.H. Miller Voxel-based analysis of grey matter magnetization transfer ratio maps in early relapsing remitting multiple sclerosis Multiple Sclerosis, May 1, 2007; 13(4): 483 - 489. [Abstract] [PDF]
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R. Zivadinov, L. Locatelli, D. Cookfair, B. Srinivasaraghavan, A. Bertolotto, M. Ukmar, A. Bratina, C. Maggiore, A. Bosco, A. Grop, et al. I nterferon beta-1a slows progression of brain atrophy in relapsing-remitting multiple sclerosis predominantly by reducing gray matter atrophy Multiple Sclerosis, May 1, 2007; 13(4): 490 - 501. [Abstract] [PDF]
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R. Magliozzi, O. Howell, A. Vora, B. Serafini, R. Nicholas, M. Puopolo, R. Reynolds, and F. Aloisi Meningeal B-cell follicles in secondary progressive multiple sclerosis associate with early onset of disease and severe cortical pathology Brain, April 1, 2007; 130(4): 1089 - 1104. [Abstract] [Full Text] [PDF]
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I. Pirko, C. F. Lucchinetti, S. Sriram, and R. Bakshi Gray matter involvement in multiple sclerosis Neurology, February 27, 2007; 68(9): 634 - 642. [Abstract] [Full Text] [PDF]
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A. Kangarlu, E.C. Bourekas, A. Ray-Chaudhury, and K.W. Rammohan Cerebral Cortical Lesions in Multiple Sclerosis Detected by MR Imaging at 8 Tesla AJNR Am. J. Neuroradiol., February 1, 2007; 28(2): 262 - 266. [Abstract] [Full Text] [PDF]
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M.P. Wattjes, G.G. Lutterbey, J. Gieseke, F. Traber, L. Klotz, S. Schmidt, and H.H. Schild Double Inversion Recovery Brain Imaging at 3T: Diagnostic Value in the Detection of Multiple Sclerosis Lesions AJNR Am. J. Neuroradiol., January 1, 2007; 28(1): 54 - 59. [Abstract] [Full Text] [PDF]
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L. Bo, J. J. G. Geurts, P. van der Valk, C. Polman, and F. Barkhof Lack of Correlation Between Cortical Demyelination and White Matter Pathologic Changes in Multiple Sclerosis Arch Neurol, January 1, 2007; 64(1): 76 - 80. [Abstract] [Full Text] [PDF]
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J H Simon Brain atrophy in multiple sclerosis: what we know and would like to know Multiple Sclerosis, November 1, 2006; 12(6): 679 - 687. [Abstract] [PDF]
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F. Bagnato, J.A. Butman, S. Gupta, M. Calabrese, L. Pezawas, J.M. Ohayon, F. Tovar-Moll, M. Riva, M.M. Cao, S.L. Talagala, et al. In Vivo Detection of Cortical Plaques by MR Imaging in Patients with Multiple Sclerosis AJNR Am. J. Neuroradiol., November 1, 2006; 27(10): 2161 - 2167. [Abstract] [Full Text] [PDF]
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M. Rovaris, E. Judica, A. Gallo, B. Benedetti, M. P. Sormani, D. Caputo, A. Ghezzi, E. Montanari, A. Bertolotto, G. Mancardi, et al. Grey matter damage predicts the evolution of primary progressive multiple sclerosis at 5 years Brain, October 1, 2006; 129(10): 2628 - 2634. [Abstract] [Full Text] [PDF]
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C. Wegner, M. M. Esiri, S. A. Chance, J. Palace, and P. M. Matthews Neocortical neuronal, synaptic, and glial loss in multiple sclerosis. Neurology, September 26, 2006; 67(6): 960 - 967. [Abstract] [Full Text] [PDF]
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R. H. B. Benedict, J. M. Bruce, M. G. Dwyer, N. Abdelrahman, S. Hussein, B. Weinstock-Guttman, N. Garg, F. Munschauer, and R. Zivadinov Neocortical atrophy, third ventricular width, and cognitive dysfunction in multiple sclerosis. Arch Neurol, September 1, 2006; 63(9): 1301 - 1306. [Abstract] [Full Text] [PDF]
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J. Sepulcre, J. Sastre-Garriga, M. Cercignani, G. T. Ingle, D. H. Miller, and A. J. Thompson Regional Gray Matter Atrophy in Early Primary Progressive Multiple Sclerosis: A Voxel-Based Morphometry Study. Arch Neurol, August 1, 2006; 63(8): 1175 - 1180. [Abstract] [Full Text] [PDF]
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D. Merkler, T. Ernsting, M. Kerschensteiner, W. Bruck, and C. Stadelmann A new focal EAE model of cortical demyelination: multiple sclerosis-like lesions with rapid resolution of inflammation and extensive remyelination Brain, August 1, 2006; 129(8): 1972 - 1983. [Abstract] [Full Text] [PDF]
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Y. Ge Multiple Sclerosis: The Role of MR Imaging AJNR Am. J. Neuroradiol., June 1, 2006; 27(6): 1165 - 1176. [Abstract] [Full Text] [PDF]
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M. Inglese Multiple sclerosis: new insights and trends. AJNR Am. J. Neuroradiol., May 1, 2006; 27(5): 954 - 957. [Full Text] [PDF]
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C.S. Yu, F.C. Lin, K.C. Li, T.Z. Jiang, C.Z. Zhu, W. Qin, H. Sun, and P. Chan Diffusion tensor imaging in the assessment of normal-appearing brain tissue damage in relapsing neuromyelitis optica. AJNR Am. J. Neuroradiol., May 1, 2006; 27(5): 1009 - 1015. [Abstract] [Full Text] [PDF]
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C. Oreja-Guevara, A. Charil, D. Caputo, R. Cavarretta, M. P. Sormani, and M. Filippi Magnetization transfer magnetic resonance imaging and clinical changes in patients with relapsing-remitting multiple sclerosis. Arch Neurol, May 1, 2006; 63(5): 736 - 740. [Abstract] [Full Text] [PDF]
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B. Audoin, K. T. M. Fernando, J. K. Swanton, A. J. Thompson, G. T. Plant, and D. H. Miller Selective magnetization transfer ratio decrease in the visual cortex following optic neuritis Brain, April 1, 2006; 129(4): 1031 - 1039. [Abstract] [Full Text] [PDF]
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C. M. Dalton, K. A. Miszkiel, P. W. O'Connor, G. T. Plant, G.P.A. Rice, and D. H. Miller Ventricular enlargement in MS: One-year change at various stages of disease Neurology, March 14, 2006; 66(5): 693 - 698. [Abstract] [Full Text] [PDF]
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L Ramio-Torrenta, J Sastre-Garriga, G T Ingle, G R Davies, V Ameen, D H Miller, and A J Thompson Abnormalities in normal appearing tissues in early primary progressive multiple sclerosis and their relation to disability: a tissue specific magnetisation transfer study J. Neurol. Neurosurg. Psychiatry, January 1, 2006; 77(1): 40 - 45. [Abstract] [Full Text] [PDF]
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K. T. M. Fernando, D. J. Tozer, K. A. Miszkiel, R. M. Gordon, J. K. Swanton, C. M. Dalton, G. J. Barker, G. T. Plant, A. J. Thompson, and D. H. Miller Magnetization transfer histograms in clinically isolated syndromes suggestive of multiple sclerosis Brain, December 1, 2005; 128(12): 2911 - 2925. [Abstract] [Full Text] [PDF]
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I. M. Pomeroy, P. M. Matthews, J. A. Frank, E. K. Jordan, and M. M. Esiri Demyelinated neocortical lesions in marmoset autoimmune encephalomyelitis mimic those in multiple sclerosis Brain, November 1, 2005; 128(11): 2713 - 2721. [Abstract] [Full Text] [PDF]
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Z. Caramanos, S. Narayanan, and D. L. Arnold 1H-MRS quantification of tNA and tCr in patients with multiple sclerosis: a meta-analytic review Brain, November 1, 2005; 128(11): 2483 - 2506. [Abstract] [Full Text] [PDF]
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R. A. Bermel, S. R. Puli, R. A. Rudick, B. Weinstock-Guttman, E. Fisher, F. E. Munschauer III, and R. Bakshi Prediction of Longitudinal Brain Atrophy in Multiple Sclerosis by Gray Matter Magnetic Resonance Imaging T2 Hypointensity Arch Neurol, September 1, 2005; 62(9): 1371 - 1376. [Abstract] [Full Text] [PDF]
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G. Tedeschi, L. Lavorgna, P. Russo, A. Prinster, D. Dinacci, G. Savettieri, A. Quattrone, P. Livrea, C. Messina, A. Reggio, et al. Brain atrophy and lesion load in a large population of patients with multiple sclerosis Neurology, July 26, 2005; 65(2): 280 - 285. [Abstract] [Full Text] [PDF]
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J. J. G. Geurts, P. J. W. Pouwels, B. M. J. Uitdehaag, C. H. Polman, F. Barkhof, and J. A. Castelijns Intracortical Lesions in Multiple Sclerosis: Improved Detection with 3D Double Inversion-Recovery MR Imaging Radiology, July 1, 2005; 236(1): 254 - 260. [Abstract] [Full Text] [PDF]
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G R Davies, D R Altmann, W Rashid, D T Chard, C M Griffin, G J Barker, R Kapoor, A J Thompson, and D H Miller Emergence of thalamic magnetization transfer ratio abnormality in early relapsing--remitting multiple sclerosis Multiple Sclerosis, June 1, 2005; 11(3): 276 - 281. [Abstract] [PDF]
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M. Rovaris, A. Gallo, A. Falini, B. Benedetti, P. Rossi, M. Comola, G. Scotti, G. Comi, and M. Filippi Axonal Injury and Overall Tissue Loss Are Not Related in Primary Progressive Multiple Sclerosis Arch Neurol, June 1, 2005; 62(6): 898 - 902. [Abstract] [Full Text] [PDF]
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J. Sastre-Garriga, G. T. Ingle, D. T. Chard, M. Cercignani, L. Ramio-Torrenta, D. H. Miller, and A. J. Thompson Grey and white matter volume changes in early primary progressive multiple sclerosis: a longitudinal study Brain, June 1, 2005; 128(6): 1454 - 1460. [Abstract] [Full Text] [PDF]
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A. Gallo, M. Rovaris, R. Riva, A. Ghezzi, B. Benedetti, V. Martinelli, A. Falini, G. Comi, and M. Filippi Diffusion-Tensor Magnetic Resonance Imaging Detects Normal-Appearing White Matter Damage Unrelated to Short-term Disease Activity in Patients at the Earliest Clinical Stage of Multiple Sclerosis Arch Neurol, May 1, 2005; 62(5): 803 - 808. [Abstract] [Full Text] [PDF]
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J. Sastre-Garriga, G. T. Ingle, D. T. Chard, Li. Ramio-Torrenta, M. A. McLean, D. H. Miller, and A. J. Thompson Metabolite Changes in Normal-Appearing Gray and White Matter Are Linked With Disability in Early Primary Progressive Multiple Sclerosis Arch Neurol, April 1, 2005; 62(4): 569 - 573. [Abstract] [Full Text] [PDF]
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C. Oreja-Guevara, M. Rovaris, G. Iannucci, P. Valsasina, D. Caputo, R. Cavarretta, M. P. Sormani, P. Ferrante, G. Comi, and M. Filippi Progressive Gray Matter Damage in Patients With Relapsing-Remitting Multiple Sclerosis: A Longitudinal Diffusion Tensor Magnetic Resonance Imaging Study Arch Neurol, April 1, 2005; 62(4): 578 - 584. [Abstract] [Full Text] [PDF]
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M. Tiberio, D. T. Chard, D. R. Altmann, G. Davies, C. M. Griffin, W. Rashid, J. Sastre-Garriga, A. J. Thompson, and D. H. Miller Gray and white matter volume changes in early RRMS: A 2-year longitudinal study Neurology, March 22, 2005; 64(6): 1001 - 1007. [Abstract] [Full Text] [PDF]
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J. J. G. Geurts, L. Bo, P. J. W. Pouwels, J. A. Castelijns, C. H. Polman, and F. Barkhof Cortical Lesions in Multiple Sclerosis: Combined Postmortem MR Imaging and Histopathology AJNR Am. J. Neuroradiol., March 1, 2005; 26(3): 572 - 577. [Abstract] [Full Text] [PDF]
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J.-P. Ranjeva, B. Audoin, M. Van Au Duong, D. Ibarrola, S. Confort-Gouny, I. Malikova, E. Soulier, P. Viout, A. Ali-Cherif, J. Pelletier, et al. Local Tissue Damage Assessed with Statistical Mapping Analysis of Brain Magnetization Transfer Ratio: Relationship with Functional Status of Patients in the Earliest Stage of Multiple Sclerosis AJNR Am. J. Neuroradiol., January 1, 2005; 26(1): 119 - 127. [Abstract] [Full Text] [PDF]
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M R Haupts, S Daum, G Ahle, B Holinka, and W Gehlen Transcranial magnetic stimulation as a provocation for epileptic seizures in multiple sclerosis Multiple Sclerosis, August 1, 2004; 10(4): 475 - 476. [Abstract] [PDF]
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M. P. Amato, M. L. Bartolozzi, V. Zipoli, E. Portaccio, M. Mortilla, L. Guidi, G. Siracusa, S. Sorbi, A. Federico, and N. De Stefano Neocortical volume decrease in relapsing-remitting MS patients with mild cognitive impairment Neurology, July 13, 2004; 63(1): 89 - 93. [Abstract] [Full Text] [PDF]
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G R Davies, L Ramio-Torrenta, A Hadjiprocopis, D T Chard, C M B Griffin, W Rashid, G J Barker, R Kapoor, A J Thompson, and D H Miller Evidence for grey matter MTR abnormality in minimally disabled patients with early relapsing-remitting multiple sclerosis J. Neurol. Neurosurg. Psychiatry, July 1, 2004; 75(7): 998 - 1002. [Abstract] [Full Text] [PDF]
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C. Lucchinetti and W. Bruck The pathology of primary progressive multiple sclerosis Multiple Sclerosis, June 1, 2004; 10(1_suppl): S23 - S30. [Abstract] [PDF]
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C. M. Dalton, D. T. Chard, G. R. Davies, K. A. Miszkiel, D. R. Altmann, K. Fernando, G. T. Plant, A. J. Thompson, and D. H. Miller Early development of multiple sclerosis is associated with progressive grey matter atrophy in patients presenting with clinically isolated syndromes Brain, May 1, 2004; 127(5): 1101 - 1107. [Abstract] [Full Text] [PDF]
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C. Lucchinetti and W. Bruck The pathology of primary progressive multiple sclerosis Multiple Sclerosis, May 1, 2004; 10(3_suppl): S23 - S30. [Abstract] [PDF]
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A. Feinstein, P. Roy, N. Lobaugh, K. Feinstein, P. O'Connor, and S. Black Structural brain abnormalities in multiple sclerosis patients with major depression Neurology, February 24, 2004; 62(4): 586 - 590. [Abstract] [Full Text] [PDF]
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M. C. Tartaglia, S. Narayanan, S. J. Francis, A. C. Santos, N. De Stefano, Y. Lapierre, and D. L. Arnold The Relationship Between Diffuse Axonal Damage and Fatigue in Multiple Sclerosis Arch Neurol, February 1, 2004; 61(2): 201 - 207. [Abstract] [Full Text] [PDF]
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A Traboulsee, J Dehmeshki, K. R Peters, C M Griffin, P A Brex, N Silver, O Ciccarrelli, D T Chard, G J Barker, A J Thompson, et al. Disability in multiple sclerosis is related to normal appearing brain tissue MTR histogram abnormalities Multiple Sclerosis, December 1, 2003; 9(6): 566 - 573. [Abstract] [PDF]
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L Bo, C A Vedeler, H Nyland, B D Trapp, and S J Mork Intracortical multiple sclerosis lesions are not associated with increased lymphocyte infiltration Multiple Sclerosis, August 1, 2003; 9(4): 323 - 331. [Abstract] [PDF]
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M. Sailer, B. Fischl, D. Salat, C. Tempelmann, M. A. Schonfeld, E. Busa, N. Bodammer, H.-J. Heinze, and A. Dale Focal thinning of the cerebral cortex in multiple sclerosis Brain, August 1, 2003; 126(8): 1734 - 1744. [Abstract] [Full Text] [PDF]
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M Zarei, S Chandran, A Compston, and J Hodges Cognitive presentation of multiple sclerosis: evidence for a cortical variant J. Neurol. Neurosurg. Psychiatry, July 1, 2003; 74(7): 872 - 877. [Abstract] [Full Text] [PDF]
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M. Wylezinska, A. Cifelli, P. Jezzard, J. Palace, M. Alecci, and P. M. Matthews Thalamic neurodegeneration in relapsing-remitting multiple sclerosis Neurology, June 24, 2003; 60(12): 1949 - 1954. [Abstract] [Full Text] [PDF]
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N. De Stefano, P. M. Matthews, M. Filippi, F. Agosta, M. De Luca, M. L. Bartolozzi, L. Guidi, A. Ghezzi, E. Montanari, A. Cifelli, et al. Evidence of early cortical atrophy in MS: Relevance to white matter changes and disability Neurology, April 8, 2003; 60(7): 1157 - 1162. [Abstract] [Full Text] [PDF]
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B. Turner, X. Lin, G. Calmon, N. Roberts, and L. D Blumhardt C erebral atrophy and disability in relapsing-remitting and secondary progressive multiple sclerosis over four years Multiple Sclerosis, February 1, 2003; 9(1): 21 - 27. [Abstract] [PDF]
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D. T. Chard, C. M. Griffin, M. A. McLean, P. Kapeller, R. Kapoor, A. J. Thompson, and D. H. Miller Brain metabolite changes in cortical grey and normal-appearing white matter in clinically early relapsing-remitting multiple sclerosis Brain, October 1, 2002; 125(10): 2342 - 2352. [Abstract] [Full Text] [PDF]
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M. Rovaris, M. Bozzali, G. Iannucci, A. Ghezzi, D. Caputo, E. Montanari, A. Bertolotto, R. Bergamaschi, R. Capra, G. L. Mancardi, et al. Assessment of Normal-Appearing White and Gray Matter in Patients With Primary Progressive Multiple Sclerosis: A Diffusion-Tensor Magnetic Resonance Imaging Study Arch Neurol, September 1, 2002; 59(9): 1406 - 1412. [Abstract] [Full Text] [PDF]
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D. H. Miller, F. Barkhof, J. A. Frank, G. J. M. Parker, and A. J. Thompson Measurement of atrophy in multiple sclerosis: pathological basis, methodological aspects and clinical relevance Brain, August 1, 2002; 125(8): 1676 - 1695. [Abstract] [Full Text] [PDF]
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M. Bozzali, M. Cercignani, M. P. Sormani, G. Comi, and M. Filippi Quantification of Brain Gray Matter Damage in Different MS Phenotypes by Use of Diffusion Tensor MR Imaging AJNR Am. J. Neuroradiol., June 1, 2002; 23(6): 985 - 988. [Abstract] [Full Text] [PDF]
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A Cifelli and P M Matthews Cerebral plasticity in multiple sclerosis: insights from fMRI Multiple Sclerosis, June 1, 2002; 8(3): 193 - 199. [Abstract] [PDF]
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P Kapeller, P A Brex, D Chard, C Dalton, C M Griffin, M A McLean, G J. Parker, A J Thompson, and D H Miller Quantitative 1H MRS imaging 14 years after presenting with a clinically isolated syndrome suggestive of multiple sclerosis Multiple Sclerosis, June 1, 2002; 8(3): 207 - 210. [Abstract] [PDF]
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C M Griffin, J Dehmeshki, D T Chard, G J. Parker, G J Barker, A J Thompson, and D H Miller T1 histograms of normal-appearing brain tissue are abnormal in early relapsing-remitting multiple sclerosis Multiple Sclerosis, June 1, 2002; 8(3): 211 - 216. [Abstract] [PDF]
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M. Filippi and R. I. Grossman MRI techniques to monitor MS evolution: The present and the future Neurology, April 23, 2002; 58(8): 1147 - 1153. [Abstract] [Full Text] [PDF]
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M E Morris, C Cantwell, L Vowels, and K Dodd Changes in gait and fatigue from morning to afternoon in people with multiple sclerosis J. Neurol. Neurosurg. Psychiatry, March 1, 2002; 72(3): 361 - 365. [Abstract] [Full Text] [PDF]
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D. T. Chard, C. M. Griffin, G. J. M. Parker, R. Kapoor, A. J. Thompson, and D. H. Miller Brain atrophy in clinically early relapsing-remitting multiple sclerosis Brain, February 1, 2002; 125(2): 327 - 337. [Abstract] [Full Text] [PDF]
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