CYLINDRICAL BRONCHIECTASIS

Relatively uniform, mild airway dilatation with parallel bronchial walls. Most common and least severe. Causes include cystic fibrosis (pan-lobar), hypogammaglobulinaemia (lower lobe) and Japanese panbronchiolitis (pan-lobar).
Plain film
•  Tram-track appearance (en face dilated airways) or ring shadows (axial appearance of dilated airways)
•  Bronchial wall thickening
HRCT
•  ‘ Signet ring’ sign describes the axial view of a dilated airway of larger diameter than the accompanying artery.
•  Airways do not taper as they approach the lung periphery (airways can be seen in the peripheral third of lung).



 

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