枕骨大孔是颅底后区正中有一孔为枕骨大孔，脊髓上端在此与延髓相连。枕骨大孔形状不一，有双半环形、卵圆形、近似卵圆形、菱形等，中国人卵圆形者多见。
枕骨大孔区肿瘤，多数是良性肿瘤。
目的：探讨治疗枕骨大孔区畸形的手术方法。
Objective: To explore the operation modalities for anomalies of the foramen magnum region (AKMR).
颅颈部畸形叉称枕骨大孔区畸形，涉及的疾病较多。
Malformation of the craniocervical region, also known as malformation of the foramen magnum region, relates to many diseases.
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