label: Well Differentiated Papillary Mesothelial Tumor
label_lc: well differentiated papillary mesothelial tumor
description: A localized or multifocal mesothelial neoplasm arising from the peritoneum and less often the pleura and paratesticular region. Cases arising from the peritoneum predominantly occur 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 malignant mesothelioma.