Weegy: A splenectomy is surgery to remove the entire spleen, a delicate, fist-sized organ that sits under the left rib cage near the stomach. The spleen is an important part of the body's defense (immune) system. [ It contains special white blood cells that destroy bacteria and help your body fight infections when you are sick. It also makes red blood cells and helps remove, or filter, old ones from the body's circulation.
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