Hi Brian,
It didn't really switch to mastoid inflammation, I was merely commenting on one of the anomalies that was on my recent MRI scan, paralleling, false positives on scans in general.

While at the doctors, they brought it to my attention and they thought it may be caused by the radiation after effects.

I was unable to relocate the subsequent internet source for the quote that I gave about the "...major cause for mastoid inflammation in adults is cancer", and in fact, discovered many other potential reasons for inflammation. I apologize for anyones anxiety reading that post.