cerebral vasculitis
... that cerebral vasculitis, an inflammatory condition of the blood vessels in the brain, is so rare that there are disagreements on how it should be diagnosed?
... that <b id="mwAsw"><a href="./Cerebral_vasculitis" id="mwAs0" rel="mw:WikiLink" title="Cerebral vasculitis">cerebral vasculitis</a></b>, an <a href="./Inflammation" id="mwAs4" rel="mw:WikiLink" title="Inflammation">inflammatory</a> condition of the <a href="./Blood_vessel" id="mwAs8" rel="mw:WikiLink" title="Blood vessel">blood vessels</a> in the brain, is so <a href="./Rare_disease" id="mwAtA" rel="mw:WikiLink" title="Rare disease">rare</a> that there are disagreements on how it should be <a href="./Diagnosis" id="mwAtE" rel="mw:WikiLink" title="Diagnosis">diagnosed</a>?