Gossypiboma mistaken for a hydatid cyst: case report.

Although considered a rare complication, gossypiboma continues to be a clinically important and probably more frequently encountered than reported situation. This study aimed to report a case of gossypiboma that was mistaken for a hydatid cyst in the preoperative evaluation. A 34-year-old male patient with a history of Nissen Fundoplication presented with a large mass palpable in the epigastrium and both the left upper and lower quadrants of the abdomen. Computerized tomography was reported to show a 20x18 cm cystic mass with a collapsed germinative membrane inside it. Laparotomy, which was performed with a suggested diagnosis of type 3 hydatid cyst, revealed that the mass was caused by a 30x30 cm surgical abdominal compress. We believe gossypiboma should be kept in mind in the differential diagnosis of abdominal hydatid cysts in the presence of a former abdominal operation, especially when the result of indirect hemagglutination test is negative.