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1 Retroperitoneal abscess: An abscess (pus-filled cavity) in the retroperitoneal area (space behind the abdominal cavity).
Retroperitoneal liposarcoma is a sub type of liposarcoma, a malignant tumour of mesenchymal origin that may arise in any fat-containing region of the body.It is one of the most common primary retroperitoneal neoplasms 2. There are five histological types:1  well-differentiated: ~54%, low grade.2  lipoma-like.3  inflammatory.etroperitoneal liposarcoma is a sub type of liposarcoma, a malignant tumour of mesenchymal origin that may arise in any fat-containing region of the body.