well differentiated papillary mesothelioma peritoneal mesothelioma peritoneal well differentiated papillary mesothelioma Orphanet:676033 MEDGEN:318015 EFO:1000469 peritoneal WDPM peritoneal well differentiated papillary mesothelioma A localized or multifocal mesothelioma arising from the peritoneum. It predominantly occurs in women. It is characterized by the formation of papillae, covered by a single layer of blunt mesothelial cells. Mitotic figures are not present. There is no evidence of severe cytologic atypia. It has a relatively favorable clinical outcome, compared to diffuse malignant mesothelioma. MONDO:0006364 NCIT:C45661 UMLS:C1709507