Investigates the incidence of angiocentric lymphoma (AL) presenting as acute appendicitis. Association between AL and the Epstein-Barr virus; Effects of AL on sinonasal mucosa and on bowel, skin, soft tissue or testis in men; Manifestations of malignant lymphomas; Case report of a 32-year-old man with acute onset of right lower quadrant pain and fever; Clinical diagnosis and treatment with surgery.