Peritoneal lining: The peritoneum is a thin cellular lining that lines the inner abdominal wall and all of the organs and bowel loops within the abdomen and pelvis. It can become thickened for a variety of reasons, such as related to infection, inflammation, fibrosis, infarction, trauma, response to medication or chemotherapy, or cancer. The CT appearance of thickened peritoneal reflections by itself is nonspecific.
Answered 6/3/2015
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