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Fig. 1A —63-year-old woman with multifocal recurrence of
hepatocellular carcinoma (HCC) 9 years after hepatic resection. Transverse IV
contrast-enhanced MDCT images of liver in arterial (A) and portal
venous (B) phases compared with C-arm CT images in arterial (C)
and portal venous (D) phases obtained after administration of
transarterial contrast material before transarterial chemoembolization. On
MDCT, only three lesions (black arrows, A–D) with weak
hyperdense arterial enhancement and isodense enhancement in portal venous
phase were identified as HCC nodules. In corresponding C-arm CT images, these
lesions show strong rim enhancement in arterial phase (C) and slightly
hypodense enhancement in portal venous phase (D). An additional lesion
with equal enhancement pattern was seen only on C-arm CT (white
arrow, C and D) and was counted as false-positive finding
on C arm CT.
