Objective: To assess the clinical features and imaging diagnosis of the cystic acoustic schwannomas. Method: This prospective and retrospective study is performed on 26 patients admitted Viet-Due hospital between 2/2008 and 2/2013 for the cystic acoustic schwannomas. Results: Female/Male: 1.6/1. Mean age 54.5. Avarage time before diagnosis was estimated 8.3 months. Initial clinical symtoms included headache, dizzisse 100 percent, hearing impairment or loss in 80.8 percent. Intracranial hyperpression syndrome and cerebellar syndrome 100 percent. 19.2 percent patients had clinical manifestation of injuring cranial nerve V and 34.6 percent with clinical manifestation of injuring IX,X,XI. 84.6 percent was large tumors over 4 cm. 100 percent tumors were strong enhencement. IRM showed polycystic lesions in 96.1 percent and 73.1 percent intratumors hemorrhage, 100 percent were unchanged in diametre of internal porous acousticus. 88.4 percent had hydrocephalus. Conclusion: Cystic acoustic tomor is a special schwannoma. Clinical feature includes hearing impairment, intracranial hyperpression syndrome and cerebellar syndrome. Hearing function was still preserved in almost patients. Clinical manifestation was sometimes worse due to intracystic hemorrhage. Radiological finding was typically polycystic, well limited tumor situated at ponto-cerrebellar angle, which strongly enhenced, but no change of internal porous acousticus' image.
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