“ Relatively uniform, mild airway dilatation with parallel bronchial walls. Most common and least severe. Causes include cystic fibrosis (p...
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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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