Sludge in the gallbladder is defined as which of the following?

Sludge in the gallbladder is defined as which of the following?

• A. It is biliary sand or microlithiasis
• B. It is always cholesterol stones
• C. It is porcelain gallbladder
• D. It is acute cholecystitis

Answer: (A)

Sludge in the gallbladder is tiny particulate material that forms when bile becomes stagnant or supersaturated, leading to a suspension of microscopic crystals. On ultrasound, this appears as low-level, echogenic material that does not cast a shadow and tends to layer in the dependent part of the gallbladder; it can shift with patient position. The term biliary sand or microlithiasis best captures this finding, describing these very small particles that are not the same as discrete stones. Sludge is distinct from cholesterol stones (which are larger calculi with potential acoustic shadow), porcelain gallbladder (calcified wall), and acute cholecystitis (inflammation and often gallbladder wall thickening with possible murky bile). Sludge can be a precursor to stone formation and is commonly seen with biliary stasis or conditions that alter bile composition.

Sludge in the gallbladder is tiny particulate material that forms when bile becomes stagnant or supersaturated, leading to a suspension of microscopic crystals. On ultrasound, this appears as low-level, echogenic material that does not cast a shadow and tends to layer in the dependent part of the gallbladder; it can shift with patient position.

The term biliary sand or microlithiasis best captures this finding, describing these very small particles that are not the same as discrete stones. Sludge is distinct from cholesterol stones (which are larger calculi with potential acoustic shadow), porcelain gallbladder (calcified wall), and acute cholecystitis (inflammation and often gallbladder wall thickening with possible murky bile). Sludge can be a precursor to stone formation and is commonly seen with biliary stasis or conditions that alter bile composition.