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A 41-year-old patient with chronic myelogenous leukemia in the accelerated phase was treated with mitoxantrone. She developed pyrexia 7 days after receiving the third administration of mitoxantrone. After 3 more days, she experienced dry cough and dyspnea. Bilateral fine crackles were audible, but no signs of heart failure were found. A chest X-ray film revealed diffuse reticulogranular infiltrates bilaterally. An increase in the prednisolone dosage led to an improvement. Specimens of the bronchoalveolar lavage revealed an increase in CD4^–/CD8^– lymphocytes. The peripheral lymphocytes also expressed neither CD4 nor CD8. Specimens of a transbronchial lung biopsy disclosed thickening of the alveolar wall with infiltration of lymphoid cells.

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