while the indications for angiographic procedures are more restrictive than for noninvasive studies such as computer-assisted tomography , ultrasonography and radionuclide scanning , these procedures play a definite role in specific diagnostic situations , such as the evaluation of portal hypertension and variceal bleeding , intrahepatic mass lesions , abdominal trauma , and suspected hepatic venous occlusion ( budd-chiari syndrome ) .
C0184661
procedures
C0220825
evaluation