A collision, such as a car accident, can cause blunt force trauma to the abdominal and pelvic regions, especially in the rectouterine pouch between the uterus and the rectum. Trauma to any of the organs in this area, which is home to the liver and spleen, can cause bleeding into the peritoneal cavity. Small amounts of blood in the rectouterine pouch is a key indicator of intraperitoneal bleeding and will prompt doctors to find the source.
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