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.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.