18 Choledochocele

Clinical Presentation

A 52-year-old Asian woman complains of vague abdominal pain.

Fig. 18.1 (A–D) Axial and coronal contrast-enhanced CT images show mild prominence of the extra- and intrahepatic bile duct. The dilated duct leads to a hypodense dilated distal choledochocele within the duodenum (arrow).

Radiologic Findings

Axial and coronal contrast-enhanced computed tomography (CT) image shows mild prominence of the extra- and intrahepatic bile duct. The dilated duct leads to a hypodense dilated distal end within the duodenum (Fig. 18.1).

Diagnosis

Choledochocele (type III choledochal cyst; Table 18.1)

**Table 18.1 Types of Choledochal Cysts**
Type	Description	Occurrence (%)
I	Solitary extrahepatic cyst	50 to 70
II	Extrahepatic supraduodenal diverticulum	1 to 3
III	Intraduodenal diverticulum (choledochocele)	1 to 4
IV	Extrahepatic and intrahepatic dilatation	15 to 33
V	Multiple intrahepatic cysts (Caroli disease)	< 1