Anyone ever hear of this before? Tuesday night I found myself going to the ER with unexplained pain and burning sensation on both sides of my head near my incision sights from my 2 STA-MCA by passes.  Of course no one at my local ER knew anything about Moyamoya or even heard of these types of surgeries.  I was diagnosed with this (GCA) which strikes adults 55+ and was told left untreated could lead to blindness.  I was immediately put on an IV steroid and given a SED blood test.  My SED test came back negative but was given a script for predisone and told to see my PCP.  I saw him today and was given a second SED test and it came back negative.  I found out this GCA is unexplained and attacks blood vessels and causes them to inflame and cut off blood flow.  Sounds a little like something else ?  I am nervous because this sudden onset to blood vessels that now supply my brain has me concerned. I was appreciate any feedback or knowledge on this subject.  By the way the pain has subsided after the steroid tratment.