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a large lymphoid organ usually situated in the cranial part of the abdominal cavity on the left of the stomach. The spleen contains the largest collection of reticuloendothelial cells in the body. In ruminants the spleen is located on the left lateral wall of the reticulum and under the last two ribs on the left side.
What is spleen cancer? The spleen is an organ located under the ribs on the left side of the body. It is part of the lymphatic system, which is composed of lymph nodes, lymph vessels, lymphatic fluid, the tonsils, thymus, spleen, and lymphoid tissue of the digestive tract. The spleen filters the blood and helps the body fight infections. Most splenic cancers do not start in the spleen, and those that do are almost always lymphomas. Lymphoma is a type of blood cancer that develops in the lymphatic system.