A string or cluster of cyst-like bronchi, the most severe kind of bronchiectasis. Causes include post-infectious (e.g. pertussis and unilobar), post-obstruction and Mounier-Kuhn syndrome.
Plain film/HRCT 
•  Cysts in clusters or strings
•  Air-fluid levels commonly seen within the cysts
Cystic bronchiectasis. Chest x-ray demonstrating ring shadows in keeping with cystic bronchiectasis.


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