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10
Interstitial Lung
Disease Center, Division of Pulmonary Sciences and Critical Care
Medicine, National Jewish Medical and Research Center and University of
Colorado Health Sciences Center, Denver, Colorado 80262, USA
Correspondence to: Dr M I Schwarz email: marvin.schwarz@uchsc.edu
| The first 150 words of the full text of this article appear below. |
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Definition and aetiologies |
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The small vessel vasculitides of the lungs1-3 (table
1) are inflammatory destructive processes that affect the
arterioles, venules, and alveolar capillaries located within the
interstitial compartment. An intense infiltration of activated
neutrophils results in fibrinoid necrosis and dissolution of arteriolar
and venular walls, thus compromising the vascular lumen. Accompanying the arteriolitis and venulitis is a distinct interstitial (alveolar wall) component referred to as necrotising pulmonary
capillaritis.4-9 Necrotising pulmonary capillaritis can
occur in isolation, in the absence of histological evidence of
arteriolitis or venulitis. It is recognised by a marked interstitial
neutrophilic infiltration and many of these cells are undergoing
leucocytoclasis or fragmentation (fig 1). Because these neutrophils are
constantly undergoing cell death (apoptosis), pyknotic cells and
nuclear fragments (dust) accumulate within the lung parenchyma. The
interstitial space becomes broadened by oedema, fibrin, and the
neutrophilic infiltrate and eventually undergoes fibrinoid necrosis
(fig 2). During this process the
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