Respiratory System

The fibrosis, which varies in intensity, is more pronounced in the subpleural region (arrow)
Idiopathic pulmonary fibrosis

HONEYCOMB LUNG

The lung has a honeycomb appearance grossly. There is prominent interstitial fibrosis. Etiologies include DIP, UIP, interstitial pneumonitis associated with collagen vascular diseases, asbestosis, berylliosis, sarcoidosis, LIP, DAD, recurrent aspiration, allergic alveolitis, and idiopathic.