Table 3

Maximum tumour size on intraductal ultrasonography (IDUS) findings and final diagnosis

*Final diagnosis
Maximum tumour size on IDUSMalignantBenignTotal
aOne with inflammatory polyp, one with polypoid lesion located at the distal end of the bile duct, and one with tumour forming pancreatitis.
*The process of final diagnosis is shown in table 4.
Maximum tumour diameter or maximum wall thickening
    <10.0 mm 71522
    ≥10.0 mm37 3a40