Surprise lesion in the cecum: benign multicystic peritoneal mesothelioma

Abstract

Benign multicystic peritoneal mesothelioma (BMPM) is a rare neoplasm that is difficult to distinguish from other cystic neoplasms radiologically. A 41-year-old female patient was admitted to the emergency service with a complaint of abdominal pain. After the physical examination, and radiological imaging, ovarian torsion was assumed, and a gynecological laparoscopy was planned. A firm mass was observed in the cecal region during gynecological laparoscopy, and a right hemicolectomy was performed. There was a multicystic mass measuring 4x4x2.5 cm in the cecal region of the specimen is sent to the pathology department. Morphological findings on hematoxylin-eosin sections and immunohistochemical studies supported it, and a diagnosis of BMPM was made. The diagnosis of BMPM, which can be a challenging process considering its clinical and radiological features, is mainly made pathologically. These lesions frequently recur and rarely show a malignant transformation. Therefore, it must be evaluated in the pathological differential diagnosis.