Echogenic clot: a useful sign of pelvic hemoperitoneum.

Abstract
The sonograms of 34 patients with surgically proved pelvic hemoperitoneum were reviewed. In 15 of these patients, clotted blood was found at surgery in the pelvis or cul-de-sac. In 9 of these patients (60%), ultrasound demonstrated echogenic fluid collections or masses with an echogenicity equal to or greater than the uterus. Because anechoid fluid in the pelvis is a nonspecific finding, awareness that clotted blood can be highly echogenic may be of considerable value in the differential dignosis of pelvic fluid collections. The limitations and pitfalls in interpreting this finding are discussed.

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