Fig. 4: Mesothelioma in situ mimicking well differentiated papillary mesothelial tumor.
From: Well differentiated papillary mesothelial tumor: a new name and new problems
Low and medium power views of mesothelioma in situ mimicking a well differentiated papillary mesothelial tumor (A, B). Lesion is peritoneal. Stain for BAP1 (C) shows nuclear loss in both the papillary areas and the flat mesothelium (arrow), indicating that the correct diagnosis is mesothelioma in situ.
