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Blunt abdominal trauma with unrecognized urinary tract injury.

We report three cases of serious renal injuries due to blunt abdominal trauma within the context of multiple organ trauma. The renal involvement was not initially suspected, with resulting serious consequences. We suggest that infusion pyelography be performed prior to or shortly after surgery in all cases with extensive abdominal trauma. A retroperitoneal hematoma on explorative laparotomy in cases of multiple trauma should raise the suspicion of a concomitant serious renal injury, and an immediate diagnostic investigation should be conducted.