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· 1Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China. AbstractOBJECTIVE:To determine the characteristics of Multi-detector Row CT （MDCT） image in distinguishing renaltumors from non-renal tumors within the perirenal space in infants and children. METHODS:Data from 40 patients with surgically and pathologically proved retroperitoneal neoplasms within the perirenal space were collected. Based on the pathological findings, the patients were divided into renaltumor group （n=14） and non-renal tumor group （n=26）. The major clinical characteristics and CT characteristics of the two groups were compared. RESULTS:Incomplete renal contour with "crescent sign", "beak sign", "embedded kidney sign" and "prominent feeding artery sign" appeared in renal tumors more often than in non-renal tumors （P < 0.05）. The sign of "renal displacement and renal axis rotation" and "extra-renal central plane of tumor" appeared more often in non-renal tumors than in renal tumors （P < 0.05）. Large solid tumors with "pseudocapsule", "necrosis and cystic change", "vascularity", inferior vena cava tumor thrombus, and distant metastasis were more likely to be renal tumors than non-renal tumors （P < 0.05）. Irregular mass with calcifications appeared more often in non-renal tumors than in renal tumors （P < 0.05）. CONCLUSION:MDCT can detect the location, origin and histological feature of retroperitoneal neoplasms in infants and children. The MDCT characteristics can help differentiate renal and non-renal tumors within the perirenal space. Sichuan Da Xue Xue Bao Yi Xue Ban. 2010 Mar;41（2）:288-91, 302. PMID: 20506655 [PubMed - indexed for MEDLINE]
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