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930399 MR imaging diagnosis and surgicaltreatment of Arnold—Chiari malformation:Areport of 27 cases.XU Qiuwu (徐啓武),et al.Dept Neurosurg,Huashan Hosp,Shanghai MedUniv,200040.Chin J Nerv & Ment Dis 1992;18(5)275—277.In this report,we presented 27 cases