<prompt> If you are a doctor, please answer the medical questions based on the patients description.im 25 yrs old, my weight is 45 kg, n my lenght is 163 cm, i have a neck pain , n pain radiating to my arm , n now i have limitation of movement in my left hand, i made MRI cervical spine n this is the result:CV56 subtle minimal central posterior disc protrusion is seen indenting the subarachnoid space with no significant thecal or neural compromise. my email is YYYYYY , i want to know what is the meaning of indenting the subaracnoid space, is this mean compressing the spinal chord?  <response>: Hello, Subarachnoid space is a fluid filled space which is present all around the spinal cord throughout its length. When a small disc bulge is present it first presses on the subarachnoid space and if it increases further, there is a possibility that it will compress the cord. So in your case it is not compressing the cord. There may be orthopedic problem in neck-shoulder region which is causing your symptoms. Good luck. 