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Sarcoidosis showing reversed halo sign in 44-year-old woman.
A. High-resolution CT scan demonstrates bilateral localized round and oval areas containing central ground-glass opacities surrounded by crescent or ring-shaped areas of consolidation. Also noted are small nodules scattered throughout both lungs.
B. Photomicrograph of histopathological specimen shows scattered, well demarcated, non-necrotizing granulomas (Hematoxylin & Eosin staining; 40× magnification).
