Brain Advance Access originally published online on September 29, 2006
Brain 2006 129(12):3384-3390; doi:10.1093/brain/awl258
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Facial onset sensory and motor neuronopathy (FOSMN syndrome): a novel syndrome in neurology
1 Prince of Wales Medical Research Institute Randwick, Australia 2 Department of Neurology Boston, MA, USA 3 C. S. Kubik Laboratory for Neuropathology, Department of Pathology Massachusetts General Hospital, Harvard Medical School Boston, MA, USA
Correspondence to: Didier Cros, MD, Department of Neurology, Massachusetts General Hospital, 55 Fruit Street, Boston, MA, 02114, USA E-mail: dcros{at}partners.org
A syringomyelia-like syndrome has been infrequently reported in neurological disorders such as Tangiers disease and lepromatous leprosy. This study reports a novel syringomyelia-like syndrome in four adult male patients, which we have termed facial onset sensory and motor neuronopathy, or FOSMN syndrome, that appears to have a neurodegenerative aetiology. Clinical, neurophysiological and pathological data of four patients were reviewed, including the autopsy in one patient. Four male patients (mean age at onset 43), initially developed paraesthesiae and numbness in a trigeminal nerve distribution, which slowly progressed to involve the scalp, neck, upper trunk and upper limbs in sequential order. Motor manifestations, including cramps, fasciculations, dysphagia, dysarthria, muscle weakness and atrophy developed later in the course of the illness. Neurophysiological findings revealed a generalized sensory motor neuronopathy of caudally decreasing severity in all four patients. Autopsy in one patient disclosed loss of motoneurons in the hypoglossal nucleus and cervical anterior horns, along with loss of sensory neurons in the main trigeminal sensory nucleus and dorsal root ganglia. FOSMN syndrome appears to be a slowly progressive neurodegenerative disorder, whose pathogenesis remains to be determined.
Key Words: FOSMN syndrome; syringomyelia; motoneuron disease; sensory neuropathy
Received April 25, 2006. Revised April 18, 2006. Accepted April 18, 2006.