Narrowing of the lateral saphenous fossa by dural sac compression can compress the nerve root, resulting in symptoms such as motor disorders and sensory abnormalities. 1. Motor disorder: the clinical manifestations of different parts of the lateral saphenous fossa narrowing are different. For example, cervical lateral saphenous fossa narrowing can have upper limb muscle tone decrease, muscle spasm, upper limb movement limitation, finger movement inflexibility and other manifestations. Narrowing of the lateral saphenous fossa of lumbar vertebrae can be characterized by limitation of lower limb activities, decreased muscle tone of lower limb, muscle spasm, and so on. 2. Sensory abnormality: it can be manifested as numbness, pain, allergy and other abnormalities. For example, cervical spine lateral saphenous fossa narrowing can appear shoulder and neck or upper limb pain, numbness. If the lateral saphenous fossa of the lumbar vertebra becomes narrow, it may cause lumbar and leg pain and numbness of the lower limbs. If the above symptoms occur, it is recommended to go to the hospital in time for early and regular treatment.