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Figure 7. Transverse CT images at level of liver in 35-year-old man with history of regular alcohol consumption and clinical diagnosis of human immunodeficiency virus (patient 5). Images obtained before intravenous administration of contrast material (A) and during the hepatic arterial phase (B), portal venous phase (C), and equilibrium phase (D) show hypoattenuating (mean attenuation on unenhanced images, –17 HU) halos around portal tracts (arrows in C), sparing of liver periphery in the right lobe (arrows in D), and ill-defined confluent zones of perivascular infiltration in the left lobe that mimic a diffuse pattern of fatty infiltration of the liver. Careful review of all images indicated a predisposition of periportal zones to fatty infiltration. Infiltration was subjectively considered most conspicuous on hepatic arterial phase and portal venous phase images.
