Gallbladder sludge on ultrasonography

Ultrasonography images in a patient with gallbladder sludge.
(Panel A) A large amorphous collection of sludge within the gallbladder (arrow) that does not cast an acoustic shadow.
(Panel B) When the patient was turned onto one side, the gallbladder sludge formed a layer along the dependent portion of the gallbladder (arrows).