My husband has had a primary progressive multiple sclerosis diagnosis for 7 years. I noticed awhile back that in between the lower to middle back part of his spine, there is a section that has a protruding bump that is easily felt. Is there a chance that this is a bulging disk that could be causing his neurological systems instead?
What you're feeling is impossible for me to say without actually examining him myself, however, my guess is that you have found a soft tissue entity which could be anything from a LIPOMA (benign fatty tumor) to nodular calcifications which can be found in normal individuals.  You would not be able to FEEL a BULGING disc in the least nor could such an entity be the reason for symptoms in the lower extremities if he has been diagnosed by a specialist as having PROGRESSIVE MULTIPLE SCLEROSIS.  Either an MRI or CT scan will reveal what the mass or bump may be.  If you'd like to discuss things further or have any test results you'd like me to look at as a Neurologist myself who treats many cases of MS then, please write me at: bit.ly/ Chat Doctor. 