It is an imaging technique that uses X-rays to create cross-sectional pictures of the organs inside the abdomen. A contrast agent is used to better visualize the organs. It helps diagnose certain types of cancer such as the renal pelvis, hepatocellular, lymphoma, melanoma, ovarian, pancreatic and pheochromocytoma. Your doctor may advise this test if you have symptoms such as abdominal pain, swelling, hernia, blood in urine, and kidney stones.