The compression of the dural sac by a herniated lumbar disc 4/5 is the imaging manifestation of a herniated lumbar disc on CT and MRI. The compression of the dural sac by the herniated disc can be seen on CT and MRI and can have the following clinical manifestations: 1. low back pain, low back pain is caused by the nerve around the disc that is compressed by the herniated disc; 2. urinary and fecal disorders caused by damage to the cauda equina nerve, which can lead to constipation or diaphoresis Incontinence, there can also be symptoms of numbness and pain of the skin in the perineal area, and men can have sexual dysfunction. In this case, early examination and diagnosis is necessary. If there are only symptoms of back pain, conservative treatment is sufficient, avoid sitting for a long time, avoid getting cold, and take oral pain medications such as lumbago and meloxicam. If the cauda equina nerve is compressed and causes dysfunction or perineal skin sensation, surgery can be considered if conservative treatment is not effective.