This condition, caused by a narrowing of veins taking blood from the brain and/or spine to the heart, creating "slowed perfusion", was found in a recent study to be astonishingly common in MS Treating the narrowing with angioplasty or a stent has caused test patients to experience dramatic and long remissions. Since there is a lot of symptom overlap and diagnostic imprecision with ME and MS I thought I would post this here. http://csvi-ms.net/en It has always interested me that so many of us are diaguessed with MS at a time when "fatigue" has been an increasingly well documented and understood symptom of MS. For a time, ME was jokingly called MSlite. Also, the cholesterol XMRV connection might predispose people with a cholesterol problem and a congenitally narrow vein... so much to contemplate. I think this also shows that those who do not test positive for XMRV have other options re testing and new findings being released as we use new imaging technology. CCVI is tested for with ultrasound. Very interesting!