A Case of Peritoneal Malignant Mesothelioma Diagnosed by Laparoscopy

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A 52-year-old male visited Ishii Hospital with abdominal fullness, body weight loss, fatigue, and appetite loss. Computed tomography (CT) showed ascites, but no tumor. On positron emission tomography (PET)-CT, fluorodeoxyglucose (FDG) accumulated near the parietal peritoneum in the right abdominal cavity and near the descending colon. We were unable to make a definitive diagnosis from aspiration cytology. Therefore, we performed a laparoscopic biopsy. There was a large volume of ascites in the abdominal cavity and a white quail-egg sized mass in the right flank abdominal wall, as noted on PET-CT. We were unable to find a mass near the descending colon. The mass was resected and diagnosed as a malignant peritoneal mesothelioma pathologically. He was referred to Gunma University Hospital for chemotherapy and received a combination of gemcitabine and carboplatin.