Postirradiation localized cramp-fasciculation syndrome

Radiation plexopathy produces numbness, weakness, and reflex changes.1 Excess motor unit activity (EMUA) after irradiation manifests as myokymia and neuromyotonia in affected muscles.2,3 A 65-year-old woman presented with a pulling sensation in the left axilla and intermittent depression of the left arm of 3 to 4 months duration. Ten months earlier she had completed chemotherapy and radiation therapy after a simple mastectomy for breast …