Abstract
Most mesotheliomas have a pleural primary; peritoneal primary is less frequent. Among them, peritoneal mesothelioma is considered to be the diffuse malignant form, while multicystic peritoneal mesothelioma (BMMP) is a very rare benign tumor and a relatively new concept, first reported in Japan in 1988 as a retroperitoneal mass. We report our experience with a case of BMMP occurring in the paracolon. The patient was aware of left lower abdominal pain, and surgery was performed for the intraperitoneal mass with bowel compression. Intraoperative findings revealed jelly-like cysts up to 7 cm in size in the paracolon, and descending colon resection was performed for complete resection. The pathological diagnosis was BMMP. As of 16 months after the surgery, the patient is under observation with no recurrence. As far as we could find, there were 31 cases reported in Japan since 2000. Since there are cases of recurrence and malignant transformation of BMMPs, it is considered that thought that the treatment plan should be determined with a view toward complete resection.
