Abstract
A 76-year-old woman was admitted with a provisional diagnosis of left inguinal mass lesion. Physical examination revealed a tender left inguinal mass, which could not be reduced. Abdominal computed tomography showed left inguinal tumor and peritoneal thickening connected with the lesion. We diagnosed left inguinal hernia with invagination of the greater omentum or left ovary. We planned transabdominal preperitoneal repair (TAPP). A nodular lesion was detected in the hernia sac by laparoscopy and subsequently resected. We could not determine if the left inguinal tumor was connected with the peritoneal lesion. The inguinal tumor was resected using the anterior approach, and TAPP was performed. The pathological findings showed that both the inguinal lesion and peritoneal lesion were malignant peritoneal mesothelioma. We encountered a case of malignant peritoneal mesothelioma detected during investigation for inguinal mass.
