Vacuum-assisted biopsy was more accurate than core needle biopsy in diagnosing papillary lesions, and both sonographic features and core needle biopsy were not sufficiently accurate. Therefore, surgical excision should be performed for the accurate diagnosis of papillary lesions.

The clinicopathologic features of peritoneal mesotheliomas vary among the subtypes such as malignant mesotheliomas, cystic mesotheliomas, and well-differentiated papillary mesotheliomas, and accordingly, there is a spectrum of CT appearances.