Central nervous system(7) olfactory bulb(4) SARS-CoV-2(4) Brain(4) COVID-19(4) SARS‐CoV‐2 infection(4) virus(4) positive(3) pathology(3) Two patient(3) risk(3) Patient(3) vasculature(3) Evidence(3) hemorrhage(3) increased risk(3) caused(3) COVID19(3) were excluded(3) morphology(3) Critical(3) cerebral(3) endotheliitis.(3) feature(3) ACE2(3) amyloid angiopathy(3) Symptom(3) Disseminated intravascular coagulopathy(3) coronavirus disease 19(3) Analysis(3)