Benign Multi-Cystic Peritoneal Mesothelioma: A Case Report

Benign multicystic peritoneal mesothelioma (BMPM) is a rare disorder that occurs predominantly in reproductive-aged women. A 42-year-old male referred to our emergency department in Mousavi Hospital of Zanjan University, suffering from diffuse abdominal pain. He mentioned a history of operation two years ago, during which cystic tumors had been removed from his abdomen. A cytoreductive surgery was performed. The pathologic study confirmed the diagnosis of BMPM and immunohistochemical analysis verified the negative expression of CD34 marker and positive expression of calretinine in the cyst lining. Preoperative diagnosis of BMPM is difficult and definitive diagnosis requires histological evaluation of the specimen. Due to the rarity of BMPM, the need for familiarity with this benign but aggressive tumor is felt.