A case of Lambert-Eaton myasthenic syndrome accompanied by a small cell carcinoma of the lung.

A 57-year-old man presented with muscle stiffness and weakness accompanied by small cell carcinoma of the lung. The electromyogram showed the characteristic pattern for a Lambert-Eaton myasthenic syndrome (LEMS). The tumor of the lung was reduced in size by one-half with chemotherapy, but the muscle weakness improved only a little.