寰椎后弓先天性部分缺如１例张继东，严力生患者，男，３４岁，渔民。因枕颈部酸痛不适５年来我院求治。体格检查：枕颈部、项背部有轻度压痛，颈椎各方向活动均正常，未发现阳性神经体征。颈椎开口位Ｘ片示齿突发育好，齿突腰部处密度增高，但皮质骨连接好，两侧块不对称... Atlas after the arch congenital absence of a case of Zhang Jidong, Yan Lusheng patients, male, 34 years old, fishermen. Due to occipital neck pain and discomfort for 5 years in our hospital for treatment. Physical examination: Occipital neck, neck mild back tenderness, cervical activity in all directions were normal, no positive neurological signs were found. X-ray opening of the cervical spine shows good development of the odontoid tooth density increased at the waist, but the cortical bone connection, both sides of the block asymmetric ...