Ultrasonic evaluation of a soft tissue mass of the thigh was performed and suggested the diagnosis of myositis ossificans. Correlation with routine radiographic studies is made, as well as with the follow-up radiographic examination.

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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: (a) morphology and echo characteristics, and (b) location within either the cul-de-sac 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.