Benign multi-cystic peritoneal mesothelioma of the porta hepatis

Abstract

Presenter: Tayler James MD | Keck Hospital of USC Background: Benign multi-cystic peritoneal mesothelioma (BMPM) is a rare neoplasm of mesothelioma cells originating from serosal linings of viscous organs. her in we present a case report of benign multi-cystic peritoneal mesothelioma (BMPM) of the porta hepatis Methods: We performed a chart review of the patient and collected - preoperative findings, imaging, operative findings, and outcomes Results: A 61-year-old Hispanic woman presented with complaints of several years of chronic abdominal pain. Computerized tomography (CT) demonstrated a multi-cystic abdominal mass located near the porta hepatis. Fine needle aspiration (FNA) demonstrated benign ductal epithelial cells in a background of mucin and bile without the presence of malignant cells. During laparotomy, a large cystic mass seen emanating from the small bowel mesentery and attached to the porta hepatis as well as additional innumerable small cystic lesions through the abdomen were removed. Grossly, the abdominal mass specimen, measuring 26 x 18 x 8 cm, showed multi-loculated cysts filled with serous fluid. The final diagnosis was benign multi-cystic peritoneal mesothelioma (BMPM). Conclusion: This case highlights the difficulty of diagnosing BMPMs and differentiating it from malignant diseases that can present similarly and that can be associated with significantly worse prognosis.