Role of diffusion-weighted magnetic resonance imaging in the diagnosis of extrahepatic cholangiocarcinoma

Figure 1 A 55-year-old man with extrahepatic cholangiocarcinoma. A: Magnetic resonance cholangiopancreatography (MRCP) demonstrates the dilatation of intrahepatic ductal and gallbladder with abrupt cutoff of the common bile duct; B: The diffusion-weighted image (b = 500 s/mm²) shows the cholangiocarcinoma lesion to be a high-signal intensity lesion (arrow); C: Apparent diffusion coefficient (ADC) map (b = 500 s/mm²) image shows a low-signal intensity area (arrow) and the ADC value of this cholangiocarcinoma was 1.30 × 10^-3 mm²/s.