| Discussion: |
The follwing can be causes for false positives in US evaluation of the liver on US:
Other nonmalignant hepatic neoplasms such as hemangioma may appear similar to HCCA, although arteriovenous (A-V) shunts are uncommon. Focal nodular hyperplasia and liver cell adenoma may have extensive A-V shunting, usually occurring more often in females.
Hepatocellular CA characteristically is a hyper-attenuating nodule noted on arterial phase imaging, with hyper- and/or hypo-attenuation developing on portal venous phase imaging.