Abstract
Benign mesothelial tumors are rarer than malignant mesotheliomas and are often found in the peritoneum as incidental findings in women. They include the adenomatoid tumor (AT), the well-differentiated mesothelial tumor (WDPMT), the mesothelioma in situ (MIS), and the solid papillary mesothelial tumor (SPMT). ATs are always benign and predominantly manifest in the genital tract. WDPMTs can develop multifocally and are prone to recurrence, particularly in the case of incomplete resection. Only MISs are considered aconfirmed precursor lesion of malignant mesothelioma according to the currently valid World Health Organization (WHO) classifications. As with malignant mesothelioma, alterations of BAP1, MTAP, and p16 are detectable for MIS in contrast to the other three tumors. SPMTs cannot be clearly assigned to the other mesothelial tumors and have so far only been described in the peritoneum in women with abenign course.
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