Case Report
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World J Gastroenterol. Oct 21, 2013; 19(39): 6689-6692
Published online Oct 21, 2013. doi: 10.3748/wjg.v19.i39.6689
Diagnosis and treatment of benign multicystic peritoneal mesothelioma
Tian-Bao Wang, Wei-Gang Dai, Da-Wei Liu, Han-Ping Shi, Wen-Guang Dong
Tian-Bao Wang, Wei-Gang Dai, Han-Ping Shi, Wen-Guang Dong, Department of Surgery, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, Guangdong Province, China
Da-Wei Liu, Department of Pathology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, Guangdong Province, China
Author contributions: Wang TB performed the substantial contributions to conception and design, analysis and interpretation of data, and final approval of the version to be published; Dai WG and Liu DW performed the acquisition of data; Shi HP and Dong WG revised it critically for important intellectual content.
Correspondence to: Tian-Bao Wang, Professor, Department of Surgery, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, Guangdong Province, China. wangtianbao1@163.com.cn
Telephone: +86-20-85562842 Fax: +86-20-87332617
Received: July 15, 2013
Revised: August 10, 2013
Accepted: September 13, 2013
Published online: October 21, 2013
Processing time: 117 Days and 3.7 Hours
Abstract

Benign multicystic peritoneal mesothelioma (BMPM) is a rare cystic mesothelial lesion that occurs predominantly in reproductive aged women. A 56-year-old Caucasian male was admitted to our surgical department with a chief complaint of a painful mass in his right lower abdomen for almost 2 years. The physical examination revealed a palpable painful mass. Computed tomography demonstrated an irregular, cystic tumor in his right lower abdomen. There was no obvious capsule or internal septations. No enhancement after intravenous administration of contrast was noted. An exploratory laparotomy was performed, and a multicystic tumor and adherent to the caecum was noted. The walls of the cysts were thin and smooth, filled with clear fluid, and very friable. An en bloc resection of the tumor, including appendix and caecum, was performed. Histological examination revealed multiple cysts lined with flattened simple epithelial cells, and the capsule walls of the cysts were composed of fibrous tissue. Immunohistochemical analysis documented positive expression of mesothelial cells and calretinin. The final diagnosis was BMPM. The patient was well at 6-mo follow-up. BMPM is exceedingly rare lesion. A complete resection of the tumor is required. The diagnosis of BMPM is based on pathological analysis.

Keywords: Benign multicystic peritoneal mesothelioma; Computed tomography; Pathological analysis; Diagnosis; Resection

Core tip: Benign multicystic peritoneal mesothelioma (BMPM) is a rare cystic mesothelial lesion that occurs predominantly in reproductive aged women. The preoperative diagnosis of BMPM is difficult, and final diagnosis requires histological evaluation of a surgical specimen. In immunohistochemical analysis, positive expression of mesothelial cells and calretinin is always noted. The best treatment strategy for BMPM is en bloc removal, which can avoid recurrence. The recurrent rate after complete resection is about 50%; the recurrent tumor should be completely removed and follow-up including physical examination and imaging studies is required for all cases.