Mrs. D has been diagnosed with pericarditis ( http://en.wikipedia.org/wiki/Pericarditis ). While it's not as serious as we first feared, it still is something to be reckoned with. The doctors at the hospital were on top of things, be the ailment is considered insidious and they can't attribute it to one single thing regarding the cause. Between her own thyroid and chronic fatigue issues, her immune system has taken a beating, so it could be any number of things. Thank you so much to all who have been thinking and caring and praying. I'll keep you posted.