枕骨大孔区肿瘤的分类,较多作者沿用Cushing分类法。即按肿瘤来源、临床发展过程、手术疗效等方面分为:(1)颅脊瘤(下降型):指肿瘤来源于后颅窝组织,如棱形窝底下端,小脑下蚓部、小脑扁桃体或小脑半球后下部等处,肿瘤长入枕骨大孔区。其早期症状绝大部分有颅内压增高和相应的小脑或后组颅神经症状;(2)脊颅瘤(上升型):指肿瘤起源于枕骨大孔处或脊髓上颈段,升入颅内。其早期不伴有颅内压增高,到晚期也很少发生颅内压增高症状。我们认为把下降型列为后颅窝肿瘤较为确切,本文所讨论的病例则均属于所 In the classification of occipital large hole area tumors, more authors follow the Cushing classification. According to the tumor source, clinical development process, surgical efficacy and other aspects are divided into: (1) cranial spinal tumor (declining type): refers to the tumor from the posterior fossa tissue, such as the lower end of the prismatic base, the cerebellar vermis, cerebellar tonsils Or in the lower part of the cerebellar hemisphere, the tumor grows into the large pore area of ​​the occipital bone. Most of the early symptoms have increased intracranial pressure and corresponding cerebellar or posterior cranial nerve symptoms; (2) spinal cranial tumor (ascending type): refers to the tumor originated in the occipital foramen or cervical spinal cord, ascending into the skull Inside. It was not accompanied by an increase in intracranial pressure during the early stages, and there were few symptoms of increased intracranial pressure in the late stage. We believe that the declining type is more accurate for posterior fossa tumors. The cases discussed in this article are all