Pulmonary alveolar oedema

Last revised by Patrick J Rock on 22 May 2021

Pulmonary alveolar oedema is a particular pattern of pulmonary oedema where most of the fluid build up is in the alveolar spaces. The onset of alveolar oedema may also be associated with direct pressure-induced damage to the alveolar epithelium. It can sometimes have a central perihilar pattern. Alveolar pulmonary oedema is often preceded by interstitial pulmonary oedema and usually develops once the pulmonary venous pressure exceeds 30 mmHg 2.

Radiographic features

Plain radiograph

On chest radiographs, there are often bilateral opacities that extend in a fan-shape outwards from the hilum in a ‘batwing’ pattern. With worsening alveolar oedema, the lung opacification can become increasingly homogeneous. Air bronchograms may be seen with alveolar oedema 2.

ADVERTISEMENT: Supporters see fewer/no ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.