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Every test that requires interpretation can be "mis"interpreted, and the CAT (CT) scan is no exception. Cirrhosis of the liver results from the death of the normal liver cells followed by formation of scar tissue and re-growth of abnormal liver cells. In one type of cirrhosis (macronodular cirrhosis), re-growth results in large nodules of abnormal liver cells that may be mistaken for tumors, benign or malignant (cancer). Tests other than the CT scan may be used to help differentiate tumors from cirrhosis (e.g., angiography, MRI), but ultimately, a definite differentiation of tumor from cirrhosis usually requires a liver biopsy. For more information about liver biopsy, see our full medical article on liver biopsy.