Overview
Increased interstitial markings seen on chest x-ray may also be referred to as a fine reticular pattern
Features
Peribronchovascular connective tissue thickening
- Peribronchial cuffing (bronchus on-end)
- “Tram tracks” (side view of bronchus)
- Blurred vascular markings (indistinct margins)
Septal connective tissue thickening
- Thickened interlobular septa (called Kerley B or septal lines)
- Fine reticular pattern (Kerley C lines = superimposed Kerley B lines)
- Kerley A lines (thickened deep intraparenchymal septal bands that radiate from the hilum in the upper lungs)
- Thickened interlobar fissures (subpleural connective tissue thickening)
Causes
Acute—often associated with airspace filling
- Interstitial pulmonary edema
- Interstitial pneumonitis — viral, mycoplasma
Chronic interstitial lung diseases
- Neoplastic infiltration (lymphangitic carcinomatosis, lymphoma)
- Sarcoidosis
- Collagen-vascular diseases Interstitial pneumonitis
- Idiopathic pulmonary fibrosis
- Pneumoconiosis (silicosis, asbestosis)
Critical Care
Compendium
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