Adenomyoma of the distal common bile duct demonstrated by endoscopic ultrasound: A case report and review of the literature

Figure 1 Magnetic resonance cholangiopancreatography and computed tomography images from our case. A: Magnetic resonance cholangiopancreatography image showing proximal bile duct dilatation but ambiguous findings for evaluation of the distal common bile duct; B: Computed tomography images showing diffused dilatation of the extra-hepatic bile duct and significantly enhanced bile duct wall.

Figure 2 Endoscopic ultrasound image demonstrating a mixed echogenic structure in the distal common bile duct.

Figure 3 The gross specimen appearance of an irregular mass of the distal common bile duct near the papilla.

Figure 4 Histological findings from our case. The histological features of the resected mass arehyperplastic glandular lobules were surrounded by hyperplastic muscle fibers, fibroblasts, and myofibroblasts (Hematoxylin and eosin staining, ×200 magnification).