What is the thecal sac?

The thecal sac is a membranous covering that surrounds the spinal cord and nerve roots in the spinal canal. It is a fluid-filled sac that provides protection and support for the spinal cord and nerves. The thecal sac is formed by the dura mater, which is the outermost layer of the meninges that surround the spinal cord. It is important for maintaining the proper positioning and alignment of the spinal cord within the spinal canal.

The thecal sac can become compressed or irritated due to various spinal conditions such as herniated discs, spinal stenosis, or spinal tumors. When the thecal sac is compressed, it can cause symptoms such as pain, numbness, weakness, or tingling in the arms or legs. Treatment for compression of the thecal sac may include physical therapy, medication, or in severe cases, surgery to relieve the pressure on the spinal cord.

Overall, the thecal sac plays a crucial role in protecting the spinal cord and nerve roots and maintaining proper spinal function. It is important to address any issues with the thecal sac promptly in order to prevent further complications and improve overall spinal health.