Malignant colo-duodenal fistula: management based on proposed classification.

Duodenal involvement in colonic malignancy is a rare event and poses challenge to surgeons as it may entail major resection in a malnourished patient. Nine patients with malignant colo-duodenal fistula were reviewed retrospectively. Depending on the pattern of duodenal involvement, it was classified as-type I involving lateral duodenal wall less than half circumference; type II involving more than half circumference away from papilla; type III involving more than half circumference close to papilla. Type I was managed with sleeve resection, type II with segmental and type III with pancreaticoduodenectomy. Median age was 47 years, with male to female ratio of 2:1. Eight patients had anemia and seven had hypoproteinemia. Tumor was located in right colon in eight patients and distal transverse colon in one. Diagnosis of fistula was established by CT abdomen in seven (78%), foregut endoscopy in three and intraoperatively in two patients. Two patients had metastatic disease. Elective resection was done in seven while two required emergence surgery. Five patients underwent sleeve resection of the duodenum, two underwent segmental resection and two required pancreaticoduodenectomy. All patients had negative resection margin. One patient died. Median survival was 14 months in eight survivors. Duodenal resection in malignant colo-duodenal fistula should be tailored based on the extent and pattern of duodenal involvement. Negative margin can be achieved even with sleeve resection. En bloc pancreaticoduodenectomy is sometimes required due to extensive involvement. Resection with negative margin can achieve good survival.