The gastrojejunocolic fistula represents a clinical entity that occurs very rarely following gastro-jejunal anastomoses and manifests itself clinically and paraclinically by a severe malabsorption syndrome. The results of the physiopathological approach may be summed up as follows: reduced level of seric proteins, fluid and electrolytic depletion, deficiencies in the absorption of the vitamins soluble in fats and water, which may all vary from mildness to severeness, depending on the flow rate of the fistula. Most often, the diagnosis is set by performing barium enema, which is positive for all cases, whereas the barium passage is less efficient, enabling diagnosis in only 33% of the cases. The radiological image may be reduced on principle to one single sign: the abnormal fistulous trajectory (barium passes from the stomach directly into the colon or the enema fills the gastric lumen). It is recommended that surgical treatment be performed in a single stage, by resecting the entire fistula and re-establishing the gastro-jejunal and colic continuity. We report a case of gastrojejunocolic fistula in a patient that underwent 2/3 gastric resection for gastric ulcer 9 years ago.