Isolated mesosigmoidal hydatid cyst as an unusual cause of colonic obstruction: Report of a case

We report herein an unusual case of primary mesosigmoidal hydatid cyst that presented as acute left colonic obstruction mimicking sigmoid colon cancer . A 61-year-old man with a 3-day history of abdominal pain, distention, obs tipation, vomiting, and fever was admitted to the emergency department of o ur hospital. Surgery was performed under a presumptive diagnosis of acute l eft colonic obstruction. The intraoperative findings were highly suggestive of sigmoid colonic carcinoma and Hartmann's procedure was performed. Histo pathological examination of the pathological specimen revealed an isolated hydatid cyst embedded in mesosigmoid which had caused mechanical sigmoidal obstruction. Primary extrahepatic, intra-abdominal localization of a hydati d cyst is not unusual. Therefore, as a hydatid cyst may cause a wide variet y of clinical syndromes, it should be kept in mind in the differential diag nosis of mechanical bowel obstruction, especially in endemic regions.