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Standard reference image bank. A, Hyaline membranes. B, Fibrin thrombus. C, Airspace organisation. D, ‘Acute fibrinous and organising pneumonia’‐like intra‐alveolar fibrin. E, Acute bronchopneumonia. F, Perivascular inflammation. G, Endothelialitis. H, Fibrinoid vessel wall necrosis. I, Haemorrhage and capillaritis.
