FEV1/FVC: 86% DLCO: 13%§ CA-2†,¶ 30–39 2000s (13 yrs) Bilateral ground glass opacities and nodules Not performed Rheumatoid arthritis CA-3 30–39 2000s (11 yrs) Diffuse, upper lung predominant perilymphatic nodules FEV1: 77%§ None FVC: 83% FEV1/FVC: 76% DLCO: 70%§ CA-4 40–49 2000s (14 yrs) Subpleural nodules with upper lobe predominance;