The dural pressed and displaced was 36 cases. The nerve root pressed,displaced,thicken was 28 cases. The nerve root falled into oblivion and oedema was 16 cases.

• 椎间盘边缘突出限局性软组织影发现率100%25,硬膜囊受压移位36例,神经根受压、移位和增粗28例,有神经根湮没水肿者16例。