Tubulopapillary adenoma of the gallbladder accompanied by bile duct tumor thrombus

Figure 1 A 79-year-old female presented to our hospital for an incidentally-diagnosed gallbladder tumor. A: Coronal contrast-enhanced computed tomography (CT) image. The white arrow points to the gallbladder tumor with bile duct tumor thrombus; B: Coronal drip infusion cholangiographic CT image. The white arrow indicates the gallbladder tumor with bile duct tumor thrombus; C: Endoscopic retrograde cholangiopancreatography image. The white arrow indicates the defect due to the bile duct tumor thrombus; D: Magnetic resonance cholangiopancreatography image. The white arrow indicates the defect due to the bile duct tumor thrombus.

Figure 2 The resected specimen. Dissection of the common bile duct demonstrated a mucin-producing tumor thrombus.

Figure 3 Pathological examination of the tumor. A: Hematoxylin and eosin staining demonstrated the tumor to be a tubulopapillary adenoma with moderate epithelial atypia (× 400); B: MUC5AC staining showing positive expression (× 600).