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Air bronchogram

Dr Yuranga Weerakkody ◉ and Dr Behrang Amini et al.

Air bronchogram refers to the phenomenon of air-filled bronchi (dark) being made visible by the opacification of surrounding alveoli (grey/white). It is almost always caused by a pathologic airspace/alveolar process, in which something other than air fills the alveoli. Air bronchograms will not be visible if the bronchi themselves are opacified (e.g. by fluid) and thus indicate patent proximal airways.

Air bronchograms can be seen with several processes:

pulmonary consolidation
pulmonary edema: especially with alveolar edema ³
non-obstructive atelectasis
severe interstitial lung disease
neoplasms: bronchioloalveolar carcinoma; pulmonary lymphoma
pulmonary infarct
pulmonary hemorrhage
normal expiration

Air bronchograms that persist for weeks despite appropriate antimicrobial therapy should raise the suspicion of a neoplastic process. CT may be planned in such cases.

Radiographic features

Ultrasound

Sonographic air bronchograms arise as a secondary consequence of an extreme perturbation of the air-fluid relationship in lung parenchyma, in which fluid-filled alveoli act as an excellent acoustic medium and allow visualization of the lung parenchyma. Arborising tubular structures representing the bronchial tree may be visualized which, when patent, appear to contain punctiform-to-linear foci. These structures may remain fixed in position throughout the respiratory cycle or be observed to propagate distally and proximally with inspriation and expiration, respectively. This distinction is important for determining the etiology of the underlying pathology ⁴;

dynamic air bronchograms move centrifugally with respiration
- represent fluid mixed with air inside larger bronchi, which are in continuity with the gas inspired by the patient
- indicates a non-retractile consolidation, ruling out resorption atelectasis
- specificity of 94% and a positive predictive value of 97% for pneumonia as the cause of the consolidation
static air bronchograms lack detectable movement
- indicate isolated, trapped air, consistent with resorptive atelectasis

See also

airspace disease

References

Chest

Article information

rID: 868

System: Chest

Section: Signs

Tag: lung, refs

Synonyms or Alternate Spellings:

Air bronchograms

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Cases and figures

Case 1: multilobarCase 1: multilobar

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Case 2: with bronchoalveolar carcinomaCase 2: with bronchoalveolar carcinoma

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Case 3: on ultrasoundCase 3: on ultrasound

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Case 4: in a pediatric pneumonia Case 4: in a pediatric pneumonia

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Case 5: contusion Case 5: contusion

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Case 6: alveolar edemaCase 6: alveolar edema

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