Classic Images

Computed tomography (CT) and magnetic resonance imaging (MRI), with and without contrast, are commonly used diagnostic tests. CT and MRI allow precise visualization of organs and structures within the abdominal and/or pelvic cavity. Gallstones can be visualized on abdominal plain films, ultrasonography, and CT. Ultrasonography has varying degree of sensitivity (50-80%) but high specificity (approximately 95%) for detecting bile duct stones. Magnetic resonance cholangiopancreatography (MRCP) is highly accurate in the diagnosis of choledocholithiasis, with a sensitivity of 92-94% and specificity of 99%. Ultrasonography, along with CT and scintigraphy, is used for the diagnosis of acute cholecystitis and related complications. On CT or MRI, hemangiomas demonstrate peripheral nodular enhancement on the arterial phase, with slow progressive centripetal enhancement in more delayed images. On CT or MRI, focal nodular hyperplasia (FNH) frequently demonstrates a central scar from which fibrous bands radiate in a spoke-wheel pattern toward the periphery. CT is used to diagnose and stage pancreatitis.