軸椎の特異な形態異常により脊髄症状を生じた1症例

A Case of Myelopathy Due to A Pecuhar Anomaly of the Axis

I．はじめに

　頭蓋頸椎移行部は，先天的ないし後天的な異常をきたしやすい部位であるが，著者らは今までに報告の見られない軸椎の特異な形態異常により頸髄圧迫症状を呈した1症例を経験したので，報告する．

A very rare case of cervical myelopathy due to an anomaly of the axis was encountered. The patient was a 42-year-old man, in whom motor and sensory disturb-ance of the four extremities had been in progress dur-ing the last two years. Neurological examination re-vealed myelopathy at the high cervical cord. The op-erative findings were characterized as follows : The lamina on both sides of the axis was separated at the base of the spinous process.