CT Findings of Gallbladder Stones

Gallbladder stones predominantly occur in adults, with a higher prevalence in women than in men; incidence increases with age, particularly after age 40. These stones are typically cholesterol stones, cholesterol-predominant mixed stones, or black pigment stones. Below, we address the question: What are the CT imaging features of gallbladder stones?

CT Imaging Features of Gallbladder Stones

The CT appearance of gallbladder stones varies depending on stone composition. In general, CT can reflect the chemical composition of gallbladder stones, thereby providing valuable reference information for extracorporeal litholysis.

For example, cholesterol stones typically appear as low- or isodense filling defects on CT, with CT values below 40 HU. They may be solitary or multiple and are usually round or polygonal in shape. Their position often changes with patient repositioning; however, a minority may adhere to the gallbladder wall and remain immobile. Pigment stones, by contrast, appear as high-density lesions on CT, with CT values exceeding 50 HU; they may also be solitary or multiple and vary widely in size and morphology. “Sandy” (sludge-like) stones commonly settle dependently in the gallbladder fundus, appearing as high-density material that forms a fluid–level interface with the overlying bile. Mixed stones typically exhibit a rim of high density at their periphery surrounding a central low-density filling defect.

The above outlines the characteristic CT imaging features of gallbladder stones. We hope this information is helpful to you.