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WHO Classification of Tumours
Well-differentiated papillary mesothelioma
Pleura, NOS


Definition

A localized or multifocal mesothelioma arising from the pleura. 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.