[Benign mesothelial tumors]

Area of Science:

• Pathology
• Oncology
• Genetics

Context:

• Benign mesothelial tumors are less common than malignant mesotheliomas.
• These tumors are frequently discovered incidentally in the peritoneum, particularly in women.
• The main types include adenomatoid tumor (AT), well-differentiated mesothelial tumor (WDPMT), mesothelioma in situ (MIS), and solid papillary mesothelial tumor (SPMT).

Purpose:

• To differentiate benign mesothelial tumors from malignant counterparts.
• To clarify the precursor status of mesothelioma in situ (MIS) in relation to malignant mesothelioma.
• To highlight the distinct characteristics and clinical behavior of various benign mesothelial tumors.

Summary:

• Benign mesothelial tumors are rare, with ATs typically found in the genital tract and WDPMTs potentially recurring after incomplete resection.
• Mesothelioma in situ (MIS) is the sole precursor to malignant mesothelioma, sharing BAP1, MTAP, and p16 alterations.
• Solid papillary mesothelial tumors (SPMTs) present uniquely in the peritoneum of women with a benign outcome.

Impact:

• Provides a clearer classification of benign mesothelial tumors.
• Identifies MIS as a critical lesion for understanding malignant mesothelioma development.
• Aids in accurate diagnosis and management of mesothelial neoplasms.