Roughing out a 1-pc back uncovered this thing, no clue on the surface before starting. What to do...
-Pitch this back and start over (aarrrghh)
-Patch it... this would be a really challenging thing to do well, with the idea that I could possibly whittle out the defect, saw out a nearby hunk from the inside and try to match the grain and flame and shape of the long, skinny, squiggly cutout. There's no assurance that this could be done without some mismatched flame or something that would stand out, and once starting down this path, there's no turning back.
-Potter... just leave it, finish it, and call it a Harry Potter scar, which might not be quite so bad under varnish.
There's no structural or tonal concern, as it's not a crack, and it's nowhere near the soundpost. There's just a small ratty zone near the middle that I've already dug out and filled. I am currently leaning toward the last option, as this it too nice of a back to throw out (not to mention the effort invested up to this point), and the patch idea is a bit frightening.