Peritoneal Well Differentiated Papillary Mesothelial Tumor

**Semantic type:** Neoplastic Process

**Definition:** A localized or multifocal mesothelial neoplasm 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.

**Synonyms:** - Peritoneal WDPM - Peritoneal WDPMT - Peritoneal Well-Differentiated Papillary Mesothelial Tumor