Mucinous carcinoma in Crohn's disease originating in a fistulous tract.

Malignant disease, including mucinous carcinomas of the colorectum, may complicate long-standing Crohn's disease. An 18-year-old male with extensive small and large bowel involvement with Crohn's disease developed recurrent peri-rectal fistulous disease that persisted for more than a decade despite pharmacological and surgical therapy as well as later therapy with biological agents. Eventually, an extensive and difficult-to-detect mucinous carcinoma developed in the fistulous tract.

Gallstone ileus of the sigmoid colon: an unusual cause of large-bowel obstruction.

Gallstone ileus of the colon is an exceedingly rare cause of large-bowel obstruction. It is usually the result of fistula formation between the gallbladder and large bowel facilitating entry of the stone into gastrointestinal tract. Contrast enhanced abdominal computed tomography is an important diagnostic aid.