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Figure 8. Transverse portal venous phase CT images in 78-year-old woman with no known risk factors for fatty infiltration of the liver (patient 6). Image obtained at initial CT examination (A) shows two portal tracts (arrows) surrounded by well-defined hypoattenuating tissue (30 HU). The abnormality persisted but was less conspicuous on images from follow-up examinations at 52 weeks (B) and 54 weeks (C), as confirmed by quantitative measurements. CNR for spared liver to fatty infiltration was 7, 5, and 1 at the first, second, and third (last) CT examinations, respectively. There were slight differences in depth of inspiration between the serial examinations. The hypoattenuation of central liver segments relative to peripheral liver segments in B and C may represent mild fatty infiltration in these areas but did not fulfill the imaging criteria for diagnosis of fatty infiltration of the liver.
