The neurological sequelae of mononucleosis.

A 37-year-old white woman presented with bilateral symmetrical ascending motor weakness. Subsequent evaluation revealed she was suffering from infectious mononucleosis. This case demonstrates that one should consider mononucleosis when presented with an idiopathic disease of the nervous system. The classic features of mononucleosis, such as pharyngitis, lymphadenopathy or splenomegaly, need not be present.