Rectal botryomycosis mimicking carcinoma.

Botryomycosis is a granulomatous disease that was first recognized in horses. The lesion is infective with fungus-like grains similar to the sulfur granules in actinomycosis. We report 54-year-old woman with a strong suspicion of rectal carcinoma that turned out to be rectal botryomycosis. She responded to erythromycin.