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*'''Gallbladder''': Gallstones are seen as hyperechoic objects, that leave an acoustic shadow. In case of similarity to a polyp ([[Ultrasonography of gallbladder polyps]]), turn the patient, making gallstones changing position, while polyps remain in the same place.
*'''Related structures''': Also exclude signs of cholecystitis, mainly pericholecystic fluid, gallbladder wall thickening, dilation of the bile duct (see below), and a sonographic Murphy's sign. Further information: [[Ultrasonography of cholecystitis]].
:*A '''dilated common bile duct''' is where it measures over 8 mm.<ref name=Lv>{{cite journal|url=https://www.ijntr.org/download_data/IJNTR01080032.pdf|title=Etiological Causes of Intrahepatic and Extrahepatic Bile Duct Dilatation|author=Yunfu Lv, Wan Yee Lau, Haiying Wu, Shunwu Chang, NingLiu, Yejuan Li, Jie Deng|journal=International Journal of New Technology and Research (IJNTR)|volume=1|issue=8|year=2015}}</ref> It is distinguished from the portal vein and hepatic artery by absence of flow on Doppler. ''Further information: '''[[Ultrasonography of dilated bile ducts]]'''
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File:Ultrasonography of common bile duct stone, with arrow.jpg|In case of a dilated bile duct, an attempt can be made to follow it to detect visible gallstones therein, such as in this case.
