Objective To analyze the features of intracranial epidermoid cyst on CT and MRI imaging.Methods 26 patients with intracranial epidermoid cysts proven pathologically were examined with pre-and post-contrst enhanced CT and MR imging,and 6 of 26 cases undergone CT plain scan.CT and MR imaging of 20cases were retrospectivelly reviewed.Results Among 26 cases,16 were located in the cisterns of cerebell opontine angle,7 in saddle area.2 inside of the skull;1in the brain essence.On CT,25 cases were homogeneous hypodense,one case was promiscuous high density,16 cases demonstrted inhomogeneous hypointensityimaging on T1WI,and inhomogenous hyperintensity on T2WI.4 cases display inhomogeneous signal.No contrast enhancement was noted except 2 cases with slightly periphery enhancement.One case brain organization receives invades,There was edema around tumor.17 cases demonstrated slightly inhomogeneous hyperintensity on FLAIR MR images,3 cases obviously advance.Conclusion The CT and MRI features of intracranial epidermoid cysts were certain characteristic,and MRI played an important role.as to uncharacteristic epidermoid cyst,there is still space for further research.

Objective To study the renal oncocytoma CT eosinophil performance,improve the rate of correct diagnosis.Methods Retrospective analysis of seven cases confirmed by pathology of renal oncocytoma CT.Results Tumor cortex to the growth mainly three cases to the pelvis grow mainly two cases,two cases are located entirely within the renal parenchyma.Plain;Four cases of tumor performance for the more homogeneous density.Three cases density uniform,which show two cases within Stelletta tenui Lindgren-sharp edge,low-density,one cases show multiple internal circular low-density category,there calcification in 2 cases.Enhanced cortex and medulla period was more homogeneous strengthen four cases,three cases heterogeneous enhance and strengthen below the renal cortex.Pelvis period density decreased,but the level not lower than the same muscle density,and normal kidney tissue clear,two cases showed a complete fake capsule.Conclusions Renal oncocytoma scar except center outside homogeneous enhancement,pelvis with a period of not less than muscle density levels,and normal kidney tissue.Coated with a complete sham and center when scar more precise diagnosis.Other typical performance required when combined with clinical analysis.