Some sort of Bone disease IIRC. One of the many rare conditions that are pretty much guaranteed to bankrupt you in the US, even with an expensive Cadillac healthcare plan.
Bah: I was trying to check the announcement, but their forum is in lockdown mode again for some reason.
Seems like every week I hear about some horrible thing happening in the US healthcare system that makes me feel both disgusted and very lucky to not have any current health problems.