Abstract
A 39-year-old man was admitted with the chief complaint of lower right abdominal pain. He did not have familial adenomatous polyposis or a history of abdominal surgery or injury. Contrast-enhanced computed tomography revealed an abdominal solid tumor (diameter, 25cm), bilateral pulmonary thromboembolism, and deep vein thrombosis. The patient's respiratory and circulatory dynamics were maintained in a stable condition, and his abdominal pain was not severe. Therefore, we administered anticoagulant therapy before the operation and induced regression of the pulmonary thromboembolus. With a tentative diagnosis of a mesenchymal tumor in the ileocecal region, we performed laparotomy and ileocecal resection for the giant abdominal tumor measuring 27.0×21.2×16.5 cm and weighing 4,840g. Histopathological and immunohistochemical analyses were performed, and the tumor was finally diagnosed as an intra-abdominal desmoid tumor. No complications were observed during the postoperative period.
