Thrombocytosis as a paraneoplastic syndrome in metastatic malignant peritoneal mesothelioma of biphasic morphology mimicking ovarian adenocarcinoma: A case report

Abstract

Malignant peritoneal mesothelioma (MPM) is a rare malignancy, presenting with non‐specific and potentially‐misleading manifestations. It represents a diagnostic pitfall as it mimics ovarian carcinoma. Maintaining a low diagnostic threshold, obtaining a detailed history, and utilizing immunohistochemical markers to diagnose MPM is crucial as early diagnosis and treatment might improve survival.We report a case of multiple primary malignancies involving malignant peritoneal mesothelioma in a 55‐year‐old female with a remote history of radiotherapy for thyroid papillary adenocarcinoma. Her advanced disease made her unfit for chemotherapy and debulking surgery. She died of cardiac arrest 2 days after palliative care referral.