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Numerous layers of honeycomb cysts in subpleural distribution, predominantly in bibasal zones. Honeycomb cysts are exuberant, large confluent, and can also be seen in the subpleural location of both upper and mid lung zones. Peribronchiovascular regions of both upper and lower lobes are also involved in the honeycombing. This honeycombing constitutes greater than 70% of the fibrotic portions of the lung- an “exuberant honeycombing” sign”
The “Straight-edge” sign is seen as a sharp demarcation between the honeycombing and the normal lung in both lower lobes.
Traction bronchiectasis with lung architectural distortion. No air trapping or abnormal ground-glass opacities.