Honeycombing in HRCT

Honeycombing is defined by the presence of small air containing cystic spaces generally lined by bronchiolar epithelium and having thick walls composed of dense fibrous tissue.

Indicates presence of end stage lung disease 

Characteristics of honeycomb cysts:

Thick walled

Air filled(black)

3-10mm in diameter 

Immediately subpleural in location 

Occur in clusters or layers and share walls

Non branching

Associated with other findings of fibrosis (traction bronchiectasis, irregular reticulation, volume loss and lung distortion)

Referrence- HRCT OF LUNG BY WEBB pg no-82(5th edition)