小脑扁桃体下疝又称Ｃｈａｒｉ氏畸形 ,依照有无延髓空洞的存在又分成为Ⅰ、Ⅱ两种类型。在既往的诊断中 ,临床症状的存在与否较为重要 ,随着ＭＲＩ影像学的普遍应用 ,对此类病变的精确诊断有了很大的进步 ,除了可明确认定有无空洞外 ,还可就畸形的严重程度和累及范围进行详细? Cerebellar tonsil hernia, also known as Chari’s deformity, according to the presence of medulla oblongata is divided into Ⅰ, Ⅱ two types. In the past diagnosis, the presence or absence of clinical symptoms is more important, with the widespread use of MRI imaging, the precise diagnosis of such lesions has made great progress, in addition to clear whether there is no empty hole, but also Deformity severity and extent of involvement in detail?