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Fig. 11A. 33-year-old woman with acute lupus pneumonitis in systemic lupus
erythematosus. 4-MDCT images show widespread centrilobular
(arrowheads, B) and diffuse ground-glass opacity, confluent
lower lobe air-space consolidation, and minimal pleural effusion. Appearances
are nonspecific; diagnosis in patients without clinical diffuse alveolar
hemorrhage is by lung biopsy or by exclusion.