Concomitant adenosquamous carcinoma and cystadenocarcinoma of the extrahepatic bile duct: A case report

Figure 1 Computed tomography and magnetic resonance cholangiopancreatography findings. A: Contrast-enhanced computed tomography showed a mass-like structure in the bile duct, and the malignant potential of the lesion could not be excluded (arrow); B: Magnetic resonance cholangiopancreatography (MRCP) revealed the dilated common bile duct; C: MRCP showed the space-occupying lesion in the hilar bile duct and the presence of a Klatskin tumor (arrow); D: Three-dimensional MRCP demonstrated a type I choledochal cyst (arrow).