What is mild ventral extradural compression of the thecal sac at L4-5?

Mild ventral extradural compression of the thecal sac at the L4-5 level refers to a slight pressure or indentation on the thecal sac, which is a protective membrane surrounding the spinal cord and spinal nerves, caused by structures such as a herniated disc or bone spurs. This condition can lead to symptoms like lower Back pain or nerve-related issues, depending on the degree of compression and any associated inflammation. While "mild" suggests that the compression is not severe, monitoring and management may still be necessary to prevent potential complications.