Pulmonary interstitial oedema

Pulmonary interstitial oedema represents a form of pulmonary oedema resulting from pathological fluid buildup in the interstitial spaces due to increased hydrostatic driving pressure.


Interstitial lung oedema arises almost exclusively due to an increase of the pulmonary capillary hydrostatic pressure (Pcap), which occurs most commonly in left sided heart failure, hence it is a key element of cardiogenic lung oedema. The increased Pcap leads to an excess filtrate filling the bronchovascular interstitium (causing the imaging appearance of peribronchial cuffing and septal thickening), and lymphatic distension (manifesting as the eponymous Kerley B lines on plain film). Interstitial oedema can quickly progress into an alveolar pattern, where the alveolar spaces became flooded too 1


Article information

rID: 73028
System: Cardiac, Chest
Section: Pathology
Synonyms or Alternate Spellings:
  • Interstitial pulmonary oedema

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Cases and figures

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