Ultrasound Evaluation of the Posterior Pelvic Compartment

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Abstract
The posterior pelvic compartment, defined as consisting primarily of the rectosigmoid colon and peritoneal-lined cul-de-sac, was evaluated in 104 patients. Tumors and pseudotumors (fluid- and feces-filled loops of bowel) were ultrasonographically analyzed according to morphology and echo characteristics, and location within the cul-de-sec or rectosigmoid colon. On routine examination, a striking similarity between pathological processes and pseudotumors was demonstrated; these were diagnosed correctly only by the use of a technique in which the rectosigmoid colon is filled with water. Combined distension of the urinary bladder and rectosigmoid colon also enabled localization and differentiation of abnormalities within the cul-de-sac.

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