What do MRI results mean when they say level C5 C6 mild diffuse spondylotic disc protrusion noted causing ventral compression with thecal sac?

C5-C6 is the lower portion of your neck. The palpable bump on the back of your lower neck is C7, so we are talking about one disc level above that. This is not serious. A disc protrusion is really a disc bulge, meaning the disc is bulging or protuding out of the normal disc area between the vertebrae. In your case it is bulging anteriorly, (ventral) or towards the front. You probably have some nerve impingement, maybe numbness/tingling in your arms or thumbs. Surgery is not recommended for this mild diagnosis. Your best bet is a chiropractor who will release the pressure on nerve and traction the neck to allow the disc to come back into place.