Introduction: Malignant primary peritoneal mesothelioma is a rare and highly aggressive tumor. This tumor can be misdiagnosed as ovarian carcinoma.
Case: Two cases of malignant primary peritoneal mesothelioma that were misdiagnosed as ovarian carcinoma were operated in our instutition. Patients were 74 and 45 years-old at admittance.
Conclusion: Malignant primary peritoneal mesothelioma is being a problem for gynecologic oncologists because of the close similarity with epithelial ovarian cancer. Diagnosis and treatment of these patients are still under debate.