Primary Peritoneal Carcinosarcoma With Metastasis to the Umbilicus and Pancreas.

A 51-year-old woman visited our hospital after being diagnosed with ascites effusion by her previous physician due to weight gain for 6 months. Ascites cytology showed adenocarcinoma, MRI showed an omental cake, and CT showed neoplastic lesions in the umbilicus and pancreas. Laparoscopy revealed that the omentum had been replaced by a tumor. Biopsies of the omentum and umbilicus revealed a carcinosarcoma. Treatment with paclitaxel and carboplatin was unsuccessful, and the patient's general condition deteriorated, leading to her demise. Pathological autopsy revealed carcinosarcoma of peritoneal origin metastasizing to the umbilicus and tail of the pancreas. No tumors were found in the uterus, ovaries, or fallopian tubes.