Chronic Mononeuropathy of the Radial Nerve: An Uncommon Manifestation of Multifocal Motor Neuropathy (MMN)

Objective: To describe chronic radial nerve palsy on one side as uncommon unifocal manifestation of MMN. Methods: Clinical study with ancillary investigations comprising neurophysiology, laboratory tests, and response to i.v. immunoglobulins (ivIg). Results: Over the last ten years, a total of 7 patients were identified who presented with unexplained pure motor wrist drop that had evolved slowly and persisted over 2–11 (mean 7) years. In 5 of them, paresis pattern suggested supinator tunnel syndrome (STS), and three of them had one or more unsuccessful surgical releases of the radial nerve. On re-evaluation, the…