Duodenocolic fistula: an unusual presentation of esophageal squamous cell carcinoma.

Duodenocolic fistula, one of the less common forms of entero-enteric fistulas, is usually associated with colonic malignancies at the hepatic flexure or Crohn's disease of the colon or duodenum. We report an unusual case of duodenocolic fistula caused by metastatic esophageal squamous cell carcinoma in which the primary esophageal tumor remained asymptomatic. In several collected series of clinical and autopsy studies of over 2800 patients, no similar complication of metastatic esophageal squamous cell carcinoma has been reported.