Minor component of ground-glass attenuation, usually associated with regions of fibrosis Reference 1. The left lower lobe consolidation obscures any reticular change. The peripheral reticular lung opacities at the mediastinal and cardiac margins give this appearance. Typically, numerous circular densities with central lucencies, usually ranging from 3 mm to 1 to 2 cm in size are located peripherally at the lung bases. This chest film shows no frank honeycombing.
Reticular densities are usually due to interstitial lung disease.
When found at the lung bases, idiopathic pulmonary fibrosis is suggested. Kerley B lines are crisp, stacked, horizontal lines seen at the periphery of the lower lung zones. Reticular densities have a criss-cross appearance.