Incidental finding of multiple well-differentiated papillary mesotheliomas in peritoneum

APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica
Mark JakobsenNiels Marcussen

Abstract

We present a case of multiple well-differentiated papillary mesotheliomas (WDPM) in the peritoneum found incidentally in a 63-year-old man with urothelial carcinoma of the bladder. When multiple tumors are seen, malignant mesothelioma should be excluded by histopathological examination as this may have a similar focal appearance to WDPM. True stromal invasion is by far the most reliable criterion of mesothelial malignancy. In doubtful cases, a conservative diagnostic approach has been recommended. Compared to malignant mesotheliomas, WDPMs are rare and have a relatively indolent clinical course with a good prognosis. Great care is needed when diagnosing mesothelial proliferations, given the crucial nature of a benign vs malignant diagnosis. No standardized treatment has yet been established.

Citations

Nov 26, 2016·Pathology International·Shigeki ShimizuAkihide Matsumura
Dec 5, 2017·BMJ Case Reports·Marta Gravito-SoaresLuis Tomé
Mar 27, 2019·International Braz J Urol : Official Journal of the Brazilian Society of Urology·Cem BasatacHaluk Akpınar

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