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1 Retroperitoneal abscess: An abscess (pus-filled cavity) in the retroperitoneal area (space behind the abdominal cavity).
Retroperitoneal lymph node dissection (RPLND) is surgery often used to treat testicular cancer. It is done to remove lymph nodes that may be cancerous from the lower back and pelvis. During the early phases of stage I nonseminoma testicular cancer, it can be very difficult to tell whether these lymph nodes are cancerous without surgically removing them first.