Yes true gout is a uric crystal formation usually in joint cavities but PSUDOgout is a build up of calcium sometimes in the joint cavity or in areas of a joint or overlapping bone plates such as how the skull of people is made up of several bony plates, Last I knew there was still a lot of unknowns/debate with psudogout hich is why I tried to get a couple of reference points for you to read. Sometimes in advanced scenarios it can even start to affect the long bones of the leg, which is why I thought maybe psudogout since there was the issue with MBD at the young age which affects calcium absorption right (from what I gathered from your MBD statement), which technically then could lead to psudogout. I know from my readings on leopard geckos, under supplimenting with D3 and over supplimenting (or even regular supplimenting) with calcium has lead to bouts of psudogout.

I would love to see if this issue gets diagnosed/resolved... I love a good mystery.