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RADIOLOGY: ABDOMEN: Case# 32895: PSEUDOMYXOMA PERITONEI. 42 year old female who is status post hysterectomy and oophorectomy as well as appendectomy for mucinous cystadenocarcinoma. There is a large amount of fluid density material within the peritoneal space. In the region of the liver there are multiple areas that are loculated as well as several areas of higher attenuation within the fluid. This material causes scalloping of the liver margins. This material causes mass effect on the stomach and is located anterior, lateral and posterior to the stomach. Moderate amount of this material is also noted within the pelvis. In pseudomyxoma peritonei, large amounts of mucinous material collects in the peritoneal cavity. This condition results most often from the rupture of a mucinous cystadenocarcinoma or cystadenoma, usually of the ovary or appendix. CT findings can range from low-attenuation masses surrounded by discrete walls to diffuse intraperitoneal low-attenuation material that may contain septations and cause scalloping of the liver margin. The walls or septations may calcify. Scalloping of the liver margin and failure of the bowel loops to "float" helps distinguish this condition from ascites.

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