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[[File:Ultrasonography of a gallstone.jpg|thumb|150px]]
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.
Also exclude signs of cholecystitis, mainly pericholecystic fluid, gallbladder wall thickening, dilation of the bile duct, and a sonographic Murphy's sign. Further information: [[Ultrasonography of cholecystitis]].
It is also proper practice to perform a {{general upper abdominal screening}}.
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