Avascular necrosis in my right humerus indicated by Weds' MRI

Just found out the results of Weds' MRI. Don't know much more than that its there at the top of my right humerus (upper arm) bone near the shoulder joint. Not even sure which of my many specialists will be treating it, what the treatment will be, etc.

The simplest explanation of this in layman's terms I could find it this one.

A more thorough but still generally understandable treatment is here.

A detailed clinical discussion specific to avascular necrosis of the humerus is here.

This is all very new to me, just heard, but skimming over it all yeh, does make me wonder if that's what happened with my femur, and may be happening a few other places.