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Figure 2. Drawings illustrate the most typical patterns of liver lesion enhancement. Enhancement may be absent (eg, cyst, small hemangioma, dysplastic nodule, or early HCC) or may be diffuse homogeneous or diffuse heterogeneous (eg, hypervascular metastasis or atypical CCC, lymphoma, FNH). Rim pattern manifests as peripheral, irregular but continuous arterial phase enhancement (eg, metastasis, CCC). The globular pattern consists of discontinuous peripheral arterial phase enhancement with discrete echoic globules (eg, cavernous hemangioma). The spokelike pattern seen during the arterial phase is due to discrete arteries radiating to the periphery (eg, FNH). The stippled pattern seen during this phase consists of discrete arteries with a chaotic distribution (eg, HCC). The arterial phase "basket" pattern, usually seen in combination with a stippled appearance, consists of a feeding artery branching around and then within a nodule (eg, HCC).
