Pulmonary capillaritis

Pulmonary capillaritis is a general term given to inflammation of the pulmonary capillaries. It is essentially a histopathological diagnosis 3.


The underlying inflammation leads to the disruption alveolar-capillary basement membrane integrity with resultant flooding of the alveoli with blood.

The key histopathologic features of pulmonary capillaritis include 2

  • capillary wall necrosis with infiltration by neutrophils
  • interstitial erythrocytes, and/or haemosiderin
  • interalveolar septal capillary occlusion by fibrin thrombi

It can result from varying underlying pathology including

If the capillaritis is widespread it can result in diffuse alveolar haemorrhage.

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Article information

rID: 29287
System: Vascular, Chest
Synonyms or Alternate Spellings:
  • Inflammation of pulmnoary capillaries

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