Abstract
A 56-year-old man was seen at a hospital because of lower abdominal pain in spring 2010. Abdominal CT revealed two hypovascular cystic tumors 6 cm in diameter with hypervascular components in the pelvis, and laparotomy was performed. Hypervascularized multicystic tumors of various sizes were observed in the omentum, with ileal invasion. Omentectomy and partial resection of the ileum were performed. Immunohistochemically, these tumors were diagnosed as benign multicystic peritoneal mesothelioma (BMPM) with adenomatoid tumor (AT) of the omentum. The composite case of BMPM with AT is rare. To the best of our knowledge, only 4 studies, other than our case, have been published to date. Malignant transformation or lymph node metastasis of BMPM has been reported of which half have been complicated by postoperative local recurrence. Our patient was also reoperated for recurrence. With the induction of adjuvant chemotherapy, he has been free of recurrence 24 months after the second surgery.
