Table 2.

Bile duct wall structure on intraductal ultrasonography (IDUS) findings and final diagnosis

	*Final diagnosis
Morphology on IDUS	Malignant	Benign	Total
Wall structure
Preserved	11	17	28
Interrupted	33	1a	34

^aOne with tumour forming pancreatitis.

*The process of final diagnosis is shown in table 4 ▶.