A Case of a Subdiaphragmatic Bronchogenic Cyst Treated by Laparoscopic Surgery

Abstract

A 64-year-old man underwent computed tomography (CT) because of discomfort in his anterior chest, and he was found to have a subdiaphragmatic tumor. Chest CT showed a 25 mm-sized subdiaphragmatic soft-tissue tumor with clear borders, and magnetic resonance imaging and positron emission tomography CT did not provide a definitive diagnosis. Considering a possibility of malignancy, we decided to perform a laparoscopic tumor resection. The tumor was located in the vicinity of the falciform ligament of the liver under the left diaphragm and could be resected without damaging the capsule. Postoperative histopathological examination revealed a cyst with a lumen lined by pseudostratified ciliated epithelium, and the cyst wall had smooth muscle layers through connective fibers. Based on the above, we diagnosed this mass as a bronchogenic cyst. Bronchogenic cyst is a congenital cyst of prenatal foregut origin, and the occurrence in the abdominal region is extremely rare.