Hi there. Thecal sac is the elongated tube that extends from the brain to the end of the spine in which the spinal cord and nerve roots run. This is made up of and is continuous with the membrane that covers the brain. Flattening of thecal sac occurs when a herniated disc has extended so far into the spinal canal that is pushing on the thecal sac. You have this at C7 level which is causing the shoulder and arm symptoms in you. Consult a neurosurgeon about the possibility of surgical correction and the role of physiotherapy is significant. Consult a physical therapist for the needful till you are taken up for surgery and otherwise. Take care.
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