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(A) Chest CAT scan from a 60-year-old woman with 6 months of cough, exertional breathlessness, and fatigue. (B) Surgical lung biopsy shows a homogenous pattern of fibrosis and chronic inflammation with a paucity of normal lung. Magnification, ×40. (C) Chest CAT after treatment with a combination of prednisone and mycophenolate mofetil.
