Table 1

Morphology on intraductal ultrasonography (IDUS) findings and final diagnosis

*Final diagnosis
Morphology on IDUSBiopsy positiveBiopsy negativeBenignTotal
aTwo with bile duct stone, one with post out mobile injury, one with chronic pancreatitis, one with primary sclerosing cholangitis, and one with Mirizzi's syndrome; btwo with bile duct thrombi by hepatocellular carcinoma; csix with pancreatic cancer, two with peripheral cholangiocarcinoma, and one with gall bladder cancer; and done with tumour forming pancreatitis.
*The process of final diagnosis is shown in table 4.
Without sessile tumour
    No apparent lesion 0 0 2 2
    Localised wall thickening 1 1 6a 8
    Polypoid lesion 8 2b 919
Sessile tumour
    Intraductal sessile tumour12 1 013
    Sessile tumour outside of the bile duct10 9c 1d20