Cytomegalovirus mononucleosis-associated antral gastritis simulating malignancy.

A 44-year-old man with epigastric pain, fever, and atypical lymphocytosis was found to have severe antral gastritis with radiologic and endoscopic features suggestive of malignancy. Histopathologic and serologic findings were diagnostic of cytomegalovirus gastric infection. Clinical involvement of the stomach in the course of cytomegalovirus mononucleosis is unique, and this case expands further the spectrum of clinical disease in the otherwise healthy adult.