A 79-year-old woman was admitted to the hospital for progressive dyspnea and severe hypoxemia, requiring oxygen supplementation. The dyspnea started approximately 3 to 4 weeks before presentation and was slowly progressive throughout the following weeks. Her medical history mentioned an adenocarcinoma with an epidermal growth factor receptor (EGFR) exon 19 deletion of the lung with metastases to the bones and brain for which treatment with osimertinib was started 14 months earlier.
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