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Figure 8a. Lipoid pneumonia in a 52-year-old man with a persistent area of consolidation in the right lower lobe that was unresponsive to antibiotics. After biopsy with inconclusive results, surgical resection revealed lipoid pneumonia, and the patient gave a history of accidental aspiration of "poppers" (amyl or butyl nitrite). (a) High-resolution CT image (window level = –500 HU, window width = 1500 HU) shows a rounded area of consolidation in the right lower lobe. (b) CT image shows thickened interlobular septa and subtle tree-in-bud abnormalities just below the area of consolidation; these are features of lipoid pneumonia.
