An Inflammatory Pseudotumor of the Lung in Q Fever Pneumonia

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Abstract
INFLAMMATORY pseudotumor" is a generic term for a lung mass, usually solitary, composed of mixtures of histiocytes or macrophages (sometimes lipid-filled — i.e., "foam cells"), plasma cells, lymphocytes, fibroblasts, and collagen.1 Because these components are present in highly variable ratios and spatial interrelations,2 3 4 5 these lesions have been designated variously as "plasma-cell granuloma," "fibrohistiocytoma," "xanthoma," "xanthofibroma," "xanthogranuloma," "xanthomatous pseudotumor," and "post-inflammatory pseudotumor." Their clinical features, including evidence of a preceding or concurrent respiratory infection, are also quite varied.2 3 4 , 6 , 7 However, the most consistent and clinically important feature is their radiologic mimicry of malignant neoplasms, so that nearly all reported examples have been . . .

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