Could be muscular.: On first impression, that sounds like it could be muscular, perhaps from the erector spinae muscle which courses through that area. Other possibilities exist, but that would be a first thought.
Answered 6/5/2017
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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