Abstract: Objective:To improve the diagnostic accuracy by analysis CT features of cystic renal cell carcinoma(CRCC).Methods:Retrospective analysis of 11 cases with complete clinical manifestations,CT examination and pathology of cystic renal carcinoma(CRCC) patients' data were performed.All cases underwent 64-detector row spiral CT scans and three phase enhancement including cortex,medulla,and renal pelvis phase.Multiplanar reconstruction(MPR) includes coronal and sagittal reconstruction was subsequently obtained.Results:All cases were cystic or cystic-solid tumors with regular or irregular shape and with varied size.Of 11 cases with CRCC,9 cases had mural nodular,7 cases had intratumoral septum,and tumor cyst wall calcification was found in 4 cases.Uneven thickness of the cystic wall,septa of the cysts and mural nodular were enhanced,and the pattern of the enhancement in most of the cases was the same as in carcinoma.MPR images were helpful in illustrating the detail of the tumors and the relationship with adjacent structures.Conclusion:CRCC have typical features on CT.multi-phase enhanced scanning with multi-detector row spiral CT and MPR images is helpful for making a definite diagnosis,but differential diagnosis with other cystic renal lesions must be given.