Fig 5. Constantly low apparent diffusion coefficients (ADCs) of poorly differentiated hepatocellular carcinomas (pd-HCCs).

A nonhypervascular pd-HCC on the arterial phase image (upper left) and the corresponding subtraction postcontrast image (upper middle) shows a low ADC value (0.822 × 10⁻³ mm²/s) in the polygonal region of interest (ROI) on the ADC map (upper right). In another patient, a markedly hypervascular pd-HCC on the arterial phase image (lower left) and the corresponding subtraction postcontrast image (lower middle) also shows a low ADC value (0.896 × 10⁻³ mm²/s) in the polygonal ROI on the ADC map (lower right).