Stojsic, Zorica (22942162500)Zorica (22942162500)StojsicJankovic, Radmila (36875127400)Radmila (36875127400)JankovicJovanovic, Branislav (8242860400)Branislav (8242860400)JovanovicVujovic, Dragana (56513813700)Dragana (56513813700)VujovicVucinic, Bojan (57219339351)Bojan (57219339351)VucinicBacetic, Dragoljub (8210562700)Dragoljub (8210562700)Bacetic2025-06-122025-06-122012https://doi.org/10.1016/j.jpedsurg.2012.06.029https://www.scopus.com/inward/record.uri?eid=2-s2.0-84867506661&doi=10.1016%2fj.jpedsurg.2012.06.029&partnerID=40&md5=ce227e3bd23b085a5fdcea9e6c1a2a46https://remedy.med.bg.ac.rs/handle/123456789/9508The benign cystic mesothelioma of the peritoneum is a rare lesion that occurs predominatly in women of reproductive age and has a high propensity for local recurrence. It is very rare in childhood, especially in boys, being reported in only 4 cases. A new case of benign cystic mesothelioma of the peritoneum in an 11-year-old boy is reported. The lesion occupied the entire left abdomen, arising from the transverse mesocolon, and it was accompanied by 4 small cysts. The patient had a coexistent right-sided renal agenesis. The mesothelial nature of the cysts epithelial lining cells was confirmed by immunopositivity for calretinin, cytokeratin 5/6, HBME1, and epithelial membrane antigen (EMA). No recurrence of the lesion was noted in the 7-month follow-up. Pathologists and clinicians should be aware of the existence of this rare entity in childhood to establish an accurate diagnosis and provide close follow-up after the surgery. © 2012 Elsevier Inc. All rights reserved.Benign cystic mesotheliomaChildImmunohistochemistryMalePeritoneum