(A) The presence of capillaritis is one of the few medical emergencies in pulmonary pathology. Capillaritis is distinctive but can be quite focal in the biopsy specimen. Here a “pseudo-bronchopneumonia” pattern is present, with shed neutrophils filling alveolar spaces. (B) Here the neutrophils are still within the alveolar walls. (A, B) H&E stain; (A) 40× original magnification; (B) 400× original magnification. My approach to interstitial lung disease using clinical, radiological, and histopathological patterns: Leslie KO - Journal of clinical pathology (2009). Not altered. CC.