title: Actinomycosis of the colon.
abstract: A 44-year-old woman with severe pain in the right upper quadrant, simulating acute cholecystitis, was found to have a large tumour in the transverse colon. Cultures from the mass grew Actinomyces israelii. Actinomycosis may often be missed; involvement of the large bowel is not confined to the appendiceal and cecal areas and may simulate other intra-abdominal conditions.
mesh_terms: D000190:Actinomyces / Q000302:isolation & purification; D000196:Actinomycosis / Q000175:diagnosis* / Q000209:etiology / Q000473:pathology; D000328:Adult; D003108:Colonic Diseases / Q000175:diagnosis* / Q000382:microbiology / Q000473:pathology; D005260:Female; D006801:Humans