Fig. 8.

Acute exacerbation of usual interstitial pneumonia in a 49-year-old man with rheumatoid arthritis. (a, b) Lung window images of CT scans obtained at levels of right inferior pulmonary vein (a) and liver dome (b), respectively, show extensive honeycombing in middle and lower lung zones. Also note large areas of mixed consolidation and ground-glass opacity (arrowheads) in a. (c, d) Coronal reformatted images demonstrate patchy and large areas of ground-glass opacity with crazy-paving appearance (arrows) and consolidation (open arrows). Also note large areas of honeycombing as underlying disease.