Fig. 33From: Mimics in chest disease: interstitial opacitiesCOP. HRCT at the level of the upper lobes exhibits an “ill-defined centrilobular nodular pattern” characterised by micronodules of ground-glass opacity that are diffusely distributed characteristically in the centre of the pulmonary lobules. The HRCT findings are almost indistinguishable from those in Fig. 31 or 32 Back to article page