Case report: Infectious mononucleosis in a 41-year-old man.

A 41-year-old man was found to have infectious mononucleosis, a disease frequently overlooked in patients of this age group. The symptoms and signs observed in this patient are seen in less than 10% of patients with this disease: arthralgia, epistaxis, jaundice, skin rash, and pneumonitis. Although mildly depressed platelet counts are common in patients with infectious mononucleosis, the count in this patient was markedly depressed.