Types

 airway-centered interstitial fibrosis

Synopsis

 honeycombing

Etiology

 UIP (usual interstitial pneumonia) or idiopathic pulmonary fibrosis
 lymphocytic interstitial pneumonia (LIP)
 connectivitis (collagen vascular diseases)
 drug reactions
 pneumoconioses

• asbestosis
• berylliosis
• silicosis
• hard metal pneumoconiosis

 sarcoidosis
 Langerhans histiocytosis
 chronic granulomatous infections
 chronic aspiration
 chronic hypersensitivity pneumonitis
 organized chronic eosinophilic pneumonia
 organized and organizing diffuse alveolar damage
 chronic interstitial pulmonary edema
 passive congestion
 post-radiation
 healed infectious pneumonias