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181. Conclusion: Based on the MRI signal features, central position and margin, correct diagnosis can be made for most of the basicranial nasopharyngeal carcinoma, chordoma and pituitary adenoma.

182. Objective To evaluate the value and limitation of MRI in the diagnosis of meningovascular neurosyphilis.

183. Objective MRI has been widely used in clinical diagnosis and surgical operation planning. It is important to extract the brain structure from MRI.

184. Objective To study features of callosal lipoma and the value of CT and MRI in the diagnosis.

185. Materials and Method:CT and MRI examinations of 35 children with sacrococcygeal germ cell tumors proved by surgery and pathology were reviewed, retrospectively.

186. Objective To investigate the diagnostic value of MRI in ovarian cystadenoma .

187. Conclusion Cranial MRI contributed to early stage diagnosis of virus encephalitis.

188. Objective To discuss the MRI and CT imaging features of tumorous diseases in the cerebellar hemisphere in order to improve the accuracy of diagnosis.

189. Objective: To analyze MRI characteristics of hypertrophic olivary degeneration(HOD) in order to improve our knowledge for this disease.