Gallbladder polyp versus gallstone on ultrasound

Ultrasound images of a gallbladder adenomatous polyp (arrow) compared with a gallstone (arrowhead). Note the shadow cast by the stone (dashed arrow) compared with the absence of a shadow behind the polyp.

Courtesy of Salam F Zakko, MD, FACP.

Graphic 70175 Version 4.0

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