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Pneumonitis in a 42-year-old man with an EGFR exon 19 deletion mutation who was treated with erlotinib in the United States. Axial chest CT images (b obtained at a lower level than a) obtained at 8 weeks of therapy show multifocal areas of GGOs in both lungs, findings that represent pneumonitis. Note the absence of traction bronchietasis or volume loss.
