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.