Lumbar 5 sacral 1 herniation compressing the dural sac is the imaging manifestation of lumbar disc herniation on CT as well as MRI, on CT and MRI you can see the compression of the dural sac by the protruding disc, lumbar disc herniation or bulging is possible. First of all, lumbar disc herniation is a common lumbar disease, it is mainly due to degenerative discs, under the action of external forces, the annulus fibrosus rupture or nucleus pulposus prolapse, etc., stimulation or compression of spinal nerves, blood vessels, spinal cord, etc. caused by lumbar pain and one or both lower limbs radiating numbness and other symptoms. Among them, the lumbar discs of lumbar 4-5 and lumbar 5-sacral 1 are the ones that bear the most force from the human body and are easy to herniate. Lumbar disc herniation can occur on both sides at the same time, unilateral herniation, or herniation in the back or center, with different herniation methods and different symptoms. Lumbar disc herniation and lumbar disc bulging although there is a degree of difference, but it does not mean that the symptoms of who is light and who is heavy, may be in the degree of heavy but the protruding disc does not stimulate the nerve and will not have symptoms. Therefore, it is recommended to go to a regular hospital, complete the examination, clear diagnosis, and follow the doctor’s instructions for targeted treatment.