In the L3/4 intervertebral stratification plane neurocanal sees the soft tissue density shade, before corresponding hard membrane pouch, fat gap vanishing, hard membrane pouch and nerve root bearing.

• L3/4椎间层面椎管内见软组织密度影，相应硬膜囊前脂肪间隙消失，硬膜囊及神经根受压。