Myopathic dropped head syndrome: an expanding clinicopathological spectrum.

Objective: A number of neuromuscular conditions may lead to a dropped head syndrome (DHS), with some patients developing a late onset noninflammatory myopathy affecting only, or predominantly, neck extensor muscles (NEM). The cause, pathogenesis, and nosological classification of this condition are unclear. To further investigate this condition, the authors evaluated the clinical, electrodiagnostic and pathologic findings in seven patients with a myopathic DHS.

Subclinical sensory involvement in monomelic amyotrophy.

An 18-year-old woman presented with weakness and atrophy in her hand without associated sensory symptoms, preceding events, or structural abnormalities on neuroimaging. No sensory deficits were detected on neurologic examination. Electrophysiological studies showed not only the expected motor findings for monomelic amyotrophy (MA) in the affected limb, but also markedly reduced sensory nerve action potentials when compared with the unaffected side.