AFP and hepatocellular carcinoma: The enhancement pattern of “fast-in and fast-out” showed a diagnostic accuracy of 36.4% (36/99) on its own, and this increased to 97.0% (96/99) if this pattern was combined with a “fast-in” observation of arterial hyperenhancement and with clinical data such as patient history of HCC and increased level of serum alpha-fetoprotein, with a sensitivity of 97.0%, specificity of 68.0%, positive predicative value (PPV) of 95.1%, and negative predicative value (NPV) of 85.0%.