Fig. 4
From: Acute neutrophilic vasculitis (leukocytoclasia) in 36 COVID-19 autopsy brains
Acute perivasculitis and mural PMN transmigration. (A) Dilated, thin-walled microvessel with serpiginous profile (arrows) is surrounded by perivascular hemorrhage containing PMNs in rostral pontine tegmentum (Case 25). (B) Higher magnification of perivascular hemorrhage in A includes many PMNs indicating acute perivasculitis (Case 25). (C) Cerebellar folial white matter microvessel with collagenosis and perivascular hemorrhage with PMNs (Case 31). (D) Temporal fusiform gyrus white matter microvessel has perivascular hemorrhage with PMNs, some appearing to be karyorrhectic (Case 31). (E) Many PMNs ringing microvessel in mid-level basis pontis are karyorrhectic (Case 10). (F) Subarachnoidal arteriolar wall with transmigrating PMNs (Case 31). Scale bars: 50 μm in (A); 20 μm in (B) and (C); 10 μm in (D–F)