Colonic Strongyloides stercoralis infection masquerading as ulcerative colitis.

Strongyloides stercoralis is a nematode infection which predominantly involves the small bowel. Spillover infection to the colon does occur, but is uncommon and is usually associated with an immunocompromised host. Accurate diagnosis is essential and, as this case demonstrates, a long history does not preclude an infective aetiology.