On chest radiographs, a reticular pattern is a collection of innumerable small linear opacities that, by summation, produce an ppearance resembling a net (synonym: reticulation) (Fig 61). This finding usually represents interstitial lung disease. The constituents of a reticular pattern are more clearly seen at thinsection CT, whether they are interlobular septal thickening, intralobular lines, or the cyst walls of honeycombing. (Reticular pattern and honeycombing
should not be considered synonymous. See also honeycombing.)