To the Editor:There are extremely broad differential diagnoses for a patient presenting with a liver mass, which includes both benign and malignant lesions. Most liver lesions can be identified based on clinical scenario and radio-logic studies. However, they frequently pose a challenge for many clinicians. Benign liver tumors compose 3 to 5 per cent of all liver tumors with hemangioma (55-60%) and focal nodular hyperplasia (FNH) (21-27%) being most common. Adenomas comprise between 8 per cent and 19 per cent of benign liver tumors and are sometimes difficult to differentiate from other benign lesions and well-differentiated hepatocellular carcinoma (HCC) radiographically. Like FNH, adenomas typically display early contrast enhancement followed by rapid washout on both MRI and CT. FNH will demonstrate a characteristic "central scar" in two-thirds of lesions.
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