Peritoneal Mesothelioma Diagnosed on Frozen Section During Diagnostic Laparoscopy: A Case Report.

Malignant mesothelioma is a rare neoplasm arising from the proliferation of mesothelial cells. When this proliferation involves the lining of the abdomen, the peritoneum, it is referred to as malignant peritoneal mesothelioma (MPM). We present a case of MPM identified during diagnostic laparoscopy, detailing the patient's symptoms and prior workup that prompted the procedure. This report describes a rare, rapidly progressive case in an elderly female patient, diagnosed via frozen section and immunohistochemistry, who experienced clinical deterioration over 24 days from initial presentation, highlighting both the diagnostic challenges and the aggressive nature of this disease.