Medical Imaging Antidiastole Of Cerebellopontine Angle Lesions

Objective: Cerebellopontine angle is one of the predilection sitesof intracranial lesions, composed6-13%of all intracranial lesions.Because of its deep location and adjacent important neurovascularstructures, CPA lesions usually has been one of the hotspots onneurosurgical treatment。 Among the cerebellopontine anglelesions,acoustic neuroma accounted for70%to80%,and meningiomasaccounted for10%to15%,epidermoid cyst about5%,other lesions lessthan1%.Effective preoperative differential diagnosis will help evaluatepatients before treatment，choose right means of treatment,make rightpositioning during surgery and predict prognosis. In recent years,imaging technology, especially the development of X-ray computertomography and magnetic resonance techniques provides a basis fordifferential diagnosis of cerebellopontine angle lesions.This articlesummarizes preoperative imaging changes of cerebellopontine anglelesions，and provides an objective basis for the differential diagnosis andchoose of effective treatment before operation， valuable information forsurgery and prognosis.Methods: A retrospective analysis of Chinese-Japanese UnionHospital of Jilin University Department of Neurosurgery,total imagingdata of94casescerebellopontine angle lesions before treatment between2010-2014, surgical treatment in81cases, radiation therapy in7cases,conservative treatment in6cases.The diagnosis of lesions postoperationbases on pathology.Result： acoustic neuroma usually were cystic,the expand ofinternal auditory canal in CT and iso or slightly low-intensity signals inT1WI and iso or slightly high intensity in T2WI,obvious enhancement. usually we can find auditory nerves obviously bigger.31.6percent ofMeningiomas have scattered calcification, which was high-density point,in CT,iso-intensity in T1WI and T2WI.Epidermoid cyst was as samedensity as the CSF,The resonance of MRI also similar with CSF, noenhancement, but hyper-intensity in DWI.trigeminal nerve tumor causedthe absorption of petrous apex,T1low-intensity,T2high-intensity,obviousenhanced.Hemangioblastoma usually become cysts with a muralnodule,Mural nodule were dramatically enhancement after contrastadministration,but cystic wall had not enhancement.Tuberculoma showedlight density in CT,and iso-intensity in T1WI and hyper-intensity inT2WI,obviously enhanced.Metastatic carcinoma shows low-iso-intensityon T1WI,and high-intensity on T2WI,also obvious enhance after contrastadministration.Conclusion：Image changes of cerebellopontine angle lesions. wererelevant with their histological types and properties.Analysis ofpreoperative imaging changes of cerebellopontine angle lesions providean objective basis for the differential diagnosis and choose of effectivetreatment before operation,valuable information for surgery andprognosis.