男性，重体力劳动工人，腰腿痛，并向左下肢放散，咳嗽、喷嚏时加重。检查腰部活动明显受限，并向左倾斜，直腿抬高试验阳性。病程中无低热、盗汗、消瘦症状。如有小腿及足外侧麻木，足趾跖屈力及跟腱反射弱，病变的节段应考虑是

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