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The procedure that removes the gallbladder is called cholecystectomy. This surgery is performed when there are issues with the gallbladder, such as gallstones or inflammation, which can lead to pain, infection, or other complications. The technique can be performed either through traditional open surgery or minimally invasive laparoscopic methods, which typically result in shorter recovery times and less postoperative pain.
Other surgical procedures listed have different indications: nephrectomy refers to the removal of a kidney, gastrectomy involves the removal of part or all of the stomach, and colostomy creates an opening from the colon to the abdomen for the diversion of stool. Thus, cholecystectomy is clearly the correct terminology for gallbladder removal.