Nakamura T, Kadoya S, Itoh S, Kwak R, Suzuki T, Satoh S
No Shinkei Geka. 1987 Feb;15(2):221-5.
Two cases of aplasia of the posterior arch of the atlas incidentally found are reported. Case 1: A 37-year-old man hit the forehead and the right mandible against the front glass at a head-on collision of his car and was brought to the emergency room. He was alert and neurologically normal except for multiple incision wounds with glass fragments in the face. CT, and cervical X-rays revealed total absence of the posterior arch of the atlas. Case 2: A 73-year-old woman, who sustained whip lash injury at an automobile accident, was admitted several hours after injury, complaining of neck and occipital pain. No neurological deficit was seen. CT demonstrated hemi-aplasia of the posterior arch of the atlas and isolated rudimentary posterior tubercle. Review of the literature and discussions were made on the incidence and genesis of this anomaly.
报告了两例偶然发现的寰椎后弓发育不全病例。病例1：一名37岁男性在汽车正面碰撞时前额和右下颌撞到前挡风玻璃，被送往急诊室。除面部有多处玻璃碎片切割伤外，他意识清醒，神经系统正常。CT和颈椎X线检查显示寰椎后弓完全缺如。病例2：一名73岁女性在一次汽车事故中遭受挥鞭样损伤，受伤数小时后入院，主诉颈部和枕部疼痛。未发现神经功能缺损。CT显示寰椎后弓半发育不全及孤立的残留后结节。对该异常的发生率和成因进行了文献复习和讨论。
