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1 Retroperitoneal abscess: An abscess (pus-filled cavity) in the retroperitoneal area (space behind the abdominal cavity).
A retroperitoneal lymph node biopsy is a procedure for removing small pieces of tissue from your lymph nodes for lab tests. The retroperitoneal lymph nodes are at the back of your abdominal and pelvic cavity. Your healthcare provider may suspect that you have cancer in your retroperitoneal lymph nodes.Lymph nodes are oval-shaped organs found throughout your body. The lymph nodes are like a filter, keeping bacteria and other harmful substances out of the bloodstream. They may also trap cancer cells.However, they can also develop a cancer called lymphoma.ymph nodes are oval-shaped organs found throughout your body. The lymph nodes are like a filter, keeping bacteria and other harmful substances out of the bloodstream. They may also trap cancer cells. However, they can also develop a cancer called lymphoma.