I spoke to my vet this morning and it turns out that she’d had this information the day Shadow died, but knew it wasn’t the time to disclose it as we were understandably upset. But after consulting with the dental vet, the conclusion seems to be that Mimzy’s cheek teeth are overgown. Apparently the ‘dark area’ she is seeing on the radiographs shows some curvature of the teeth. They’d like to do an ‘in mouth’ xray next, but I’d have to set that up with this other vet, plus they have what my vet calls and excellent exotics vet on staff that may be able to add in on Mimzy’s case while we’re there. She was going to call them and let them know I’d be in touch.
There is still the option of the CT scan, which my vet hinted MIGHT be performed here if certain strings were pulled. I’m holding off until the new vet can take a look at Mimzy and see what might be done otherwise.
An aside to BB, I did ask if Mimz might have that deep nasal blockage and so far the verdict is probaby (and hopefully) not. But I will ask the specialist.
I’ll most likely be making the appointment soon, as Mimz is miserable and sneezing again, not heavily… but enough to show the snot is back. 
Keeping my fingers crossed that we’re in the home stretch. I’d like to get this wrapped up because all my remaining pets have issues now that need to be addressed to differing degrees.