label: Pleural Mesothelioma In Situ
label_lc: pleural mesothelioma in situ
description: A non-invasive mesothelial neoplasm that arises from the pleura. It is characterized by the proliferation of a single-layer of flat or cuboidal neoplastic mesothelial cells. Cytological atypia is absent or minimal. Mitoses are absent. BAP1 gene inactivation and/or CDKN2A gene homozygous deletion are present. Patients present with non-resolving pleural effusion. It may progress to invasive epithelioid mesothelioma.