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Fig. 1A. —29-year-old woman with instantly detected liver lesion. Triphasic helical CT scan reveals focal nodular hyperplasia with central scar (curved arrow, left) in right liver lobe that is slightly hypodense in unenhanced phase (left); hyperdense in arterial phase (middle), with visible feeding vessel in central scar (straight arrow, middle); and slightly hyperdense in portal venous phase (right).