[Multifocal motor neuropathy with conduction block--a clinico-neuropathologic case report].

Descriptions on patients with multifocal motor neuropathy with conduction block (MMNCB), including histology, nerve fiber teasing and electron microscopy on nerve biopsy, are rare. We report a 64-year old female patient with progredient weakness of the upper extremities without sensory deficit. Electrophysiology shows conduction blocks up to 80% in several examined motor nerves. A biopsy of the sensory sural nerve reveals features of a mixed axonal and de- and remyelinating neuropathy. Thus sural nerve biopsy contributes here significantly to differential diagnosis and supports an immune mediated pathogenesis of MMNCB.