A few months ago some of you might remember I posted a Gray-banded Kingsnake that had a weird concaving to the upper 6 to 8 inches of his venter.
I got a number of suggestions w/ out anyone but Shannon Brown having seen something like this before. Shannon didn't know what it was in his snake, but that it lived quite a long time w/ the condition.
Let me start by saying that the alterna never did suffer from desiccation, and after seeing my veterinarian, and doing a fecal test which came out negative for parasites, he was as stumped as everyone else.
With suggestions from Joecop, and Cole, we both concluded that it was possible that the Gray-band had scratched it's trachea, either w/ wood chip substrate or a mouse bone or tooth.
I moved the Gray-band to a slightly warmer tub then the tub it was previously in, and fed him once a week of one or two mice. It seemed to improve after each feeding w/ the concave going away after each feeding for a couple of hours or longer, only to show the condition the next day.
We went on like this for many weeks. Slowly over time the concaving improved by getting shorter, and shorter. The concaving has completely gone away, and I've moved the snake back to it's bigger and original tub.
Here are a few photos of the aliment, and an updated present day photo or two.
The old photos from a few months ago.
Present day photos.
Looking good don't ya think? 
Thanks to everyone for their suggestions,. -Dell
