Focal fatty infiltration in the quadrate lobe of the liver accompanied by aberrant right gastric vein.

Focal fatty liver in the posterior edge of the quadrate lobe was observed in a 59-year-old woman. This lesional portion was nourished by the aberrant right gastric vein, not by the main portal vein. This abnormality in portal blood flow was suspected to be one of the causes of the focal fatty liver.