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问题:

[名词解释] abnormalities of the Cranicocervical region

答案:

颅颈区畸形(abnormalities of the Cranicocervical region):又称颅颈交界处畸形。是指颅底、枕骨大孔和上颈椎区的畸形,可有或无神经系统损害伴随。常见为颅底凹陷症、扁平颅底、Arnold-Chiari畸形。