Could you tell me what impinge upon the thecal sacs means?

Answer:
The thecal sac is the covering for the spinal cord. This can be seen on an MRI. Impingement means that something is pressing on it.
First answer by DrPeterJStanton. Last edit by DrPeterJStanton. Contributor trust: 9 [recommend contributor recommended]. Question popularity: 1 [recommend question].