[Nontraumatic hemorrhage in abdomen and retroperitoneum--CT, sonographic and clinical findings].

Sixteen patients with nontraumatic abdominal or retroperitoneal hemorrhage were examined with ultrasound (n = 16), and CT (n = 14). The lesions of the 10 patients with signs on the onset of hemorrhage were four rectus sheath hematomas, three renal subcapsular and perirenal hematomas, and subcapsular hematoma, pararenal hematoma, perirenal and parenal hematoma, on each. Fall in periphery blood hematocrit values within 24 hours after the onset was observed in only three patients. As the hematocrit value was increased, fluid area of hematoma was replaced by high density on CT and by hypoechoic area on ultrasound. The lesions of the remaining 6 patients were four renal subcapsular hematomas, one hepatic parenchymal and subcapsular hematoma, and one iliopsoas hematoma. CT is superior to ultrasound in evaluation of the nontraumatic hematomas. However, clinicians require to pay more attention to this disorder which occasionally mimick other disorders.