Cecal Perforation by a Large Gallstone: An Unusual Diagnosis.

Cholecystocolic fistulas are uncommon, with rare cases of colonic obstruction described in the literature and even rarer cases of intestinal perforation due to gallstones. We describe a case of a 73-year-old man who presented to our ED with complaints of diffuse abdominal pain, vomiting, constipation, and fever for the past week. Abdomen CT showed signs of acute perforated appendicitis. An exploratory laparotomy was proposed which revealed cecal perforation caused by a 3 cm gallstone. A right colectomy was performed with primary anastomosis, without cholecystectomy or fistula repair. The postoperative period was complicated due to an anastomotic dehiscence on day 12 with the need for a re-laparotomy with an ileotransverse colostomy confection. The patient was in the ICU care for five days and was discharged on the 13th day after the second intervention.  The clinical presentation of gallstone ileus is nonspecific and vague often leading to a delay in the diagnosis and treatment. CT scan has the best specificity and sensibility for the diagnosis but abdominal X-ray may show the pathognomonic Rigler´s triad. The surgical treatment consists of removing the gallstone with or without simultaneous cholecystectomy and fistula repair. Reports of colonic perforation due to gallstones are very scarce, which makes this a very low suspicion diagnosis. The ideal surgical approach is not established. The morbidity of these cases can reach 50%.