[Differential diagnosis of multifocal motor neuropathy and related diseases].

Multifocal motor neuropathy (MMN) is a rare disease of the peripheral nervous system pathogenetically related to local demyelinization and formation of excitation conduction blocks. MMN affect only those nerves and their segments that comprise excitation conduction blocks. Such blocks have a persistent character and show a mosaic pattern over motor fibres which accounts for the specific clinical picture of MMN.