According to the Medical University of South Carolina Digestive Disease Center, most people who have gallbladder sludge must have the organ removed. This is typically done with laparoscopic surgery, which requires small incisions rather than a large abdominal opening.
According to The Merck Manual Home Health Handbook, gallbladder sludge is often caused by the accumulation of substances such as cholesterol, calcium compounds and bilirubin. These materials stay in the gallbladder but don't form stones. Sometimes the sludge is caused by pregnancy, and once the baby is born, the sludge leaves the organ. If sludge remains, it often forms gallstones or passes out of the gallbladder and blocks digestive system ducts.