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Neoplastic and non-neoplastic proliferative disorders of the perirenal space: cross-sectional imaging findings Surabhi VR; Menias C; Prasad SR; Patel AH; Nagar A; Dalrymple NCRadiographics 2008[Jul]; 28 (4): 1005-17The perirenal space, located between the anterior and the posterior renal fasciae, is shaped like an inverted cone with an apex that extends into the iliac fossa. Perirenal tumors and pseudotumors primarily originate either from the kidney or as part of a systemic disease process and have characteristic histopathologic features and biologic behavior. The lesions may be classified on the basis of their distribution and imaging features as solitary soft-tissue masses (renal cell carcinoma, lymphangioma, hemangioma, and leiomyoma), rindlike soft-tissue lesions (lymphoma, retroperitoneal fibrosis, and Erdheim-Chester disease), masses containing macroscopic fat (angiomyolipoma, liposarcoma, myelolipoma, and extramedullary hematopoiesis), and multifocal soft-tissue masses (metastases, plasma cell tumors). Because of overlap in imaging findings among these diverse perirenal lesions, a definitive diagnosis in most cases can be established only at histopathologic analysis. However, an imaging pattern-based approach may facilitate the diagnosis and optimal management of perirenal tumors and pseudotumors.|Connective Tissue Diseases/*diagnostic imaging[MESH]|Female[MESH]|Humans[MESH]|Kidney Neoplasms/*diagnostic imaging[MESH]|Male[MESH]|Soft Tissue Neoplasms/*diagnostic imaging[MESH]|Tomography, X-Ray Computed/*methods[MESH] |
