Mesothelioma In Situ Mimicking Well-differentiated Papillary Mesothelial Tumor.
Journal
The American journal of surgical pathology
ISSN: 1532-0979
Titre abrégé: Am J Surg Pathol
Pays: United States
ID NLM: 7707904
Informations de publication
Date de publication:
01 05 2023
01 05 2023
Historique:
medline:
19
4
2023
pubmed:
7
3
2023
entrez:
6
3
2023
Statut:
ppublish
Résumé
We have previously hypothesized that well-differentiated papillary mesothelial tumor (WDPMT) consists of 2 morphologically identical lesions, one of which is true WDPMT, while the other is a form of mesothelioma in situ. Here, we report 8 examples of the latter phenomenon, 3 with pleural disease (2 men/1 woman, ages 66 to 78 y); and 5 with peritoneal disease (all women, ages 31 to 81 y). At presentation the pleural cases all had effusions but no evidence of pleural tumor on imaging. Four of the 5 peritoneal cases had ascites as the initial finding and all 4 had nodular lesions that by imaging and/or direct inspection were thought to represent a diffuse peritoneal malignancy. The fifth peritoneal case presented with an umbilical mass. Microscopically, the pleural and peritoneal lesions looked like diffuse WDPMT, but all had lost BAP1. Occasional microscopic foci of superficial invasion were present in 3/3 pleural cases, while single nodules of invasive mesothelioma and/or occasional foci of superficial microscopic invasion were found in all of the peritoneal cases. The pleural tumor patients developed what clinically appeared to be invasive mesothelioma at 45, 69, and 94 months. Four/five peritoneal tumor patients underwent cytoreductive surgery and heated intraperitoneal chemotherapy. Three with follow-up data are alive without recurrence at 6, 24, and 36 months; 1 patient refused treatment but is alive at 24 months. We conclude that mesothelioma in situ morphologically mimicking WDPMT is strongly associated with the synchronous or metachronous development of invasive mesothelioma, but that these lesions appear to progress very slowly.
Identifiants
pubmed: 36876759
doi: 10.1097/PAS.0000000000002033
pii: 00000478-202305000-00009
doi:
Substances chimiques
Biomarkers, Tumor
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
611-617Informations de copyright
Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.
Déclaration de conflit d'intérêts
Conflicts of Interest and Source of Funding: The authors have disclosed that they have no significant relationships with, or financial interest in, any commercial companies pertaining to this article.
Références
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Lee HE, Molina JR, Sukov WR, et al. BAP1 loss is unusual in well-differentiated papillary mesothelioma and may predict development of malignant mesothelioma. Hum Pathol. 2018;79:168–176.
Berg KB, Dacic S, Miller C, et al. Utility of methylthioadenosine phosphorylase compared with BAP1 immunohistochemistry, and CDKN2A and NF2 fluorescence in situ hybridization in separating reactive mesothelial proliferations from epithelioid malignant mesotheliomas. Arch Pathol Lab Med. 2018;142:1549–1553.
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