Parkinsonism after a wasp sting.

A 49-year-old man had mild parkinsonism after being stung by a wasp, a member of the Hymenoptera order. His clinical course was stable for 6 months after which his condition rapidly progressed to a severe akinetic-rigid syndrome with evidence, on a magnetic resonance imaging brain scan, of marked destruction of the basal ganglia. The symptoms did not respond to standard antiparkinsonian medications. Repeated courses of plasmapheresis followed by monthly intravenous infusions of immunoglobulin and long-term administration of azathioprine halted and appeared to partially reverse his deterioration. The literature on the neurologic, particularly the extrapyramidal, manifestations of stings by insects of the Hymenoptera order is reviewed and the possible pathophysiological mechanisms of injury are discussed. Hymenoptera stings should be included in the differential diagnosis of acute and chronic extrapyramidal syndromes.