A 66-year-old woman presented with exertional dyspnea, leg edema, pretibial skin hemorrhages and subjectively perceived deterioration of her general condition. The medical history included hypothyroidism. The peripheral blood analysis at admission to hospital showed pancytopenia (Hgb 8.4 g/dl, WBC 3.03 x 10*9/l, platelets 28 x 10*9/l) as well as the presence of 46% of blasts. The results of the bone marrow puncture on the following day confirmed the diagnosis of acute myeloid leukemia (AML). The baseline CT of the thorax five days after admission to hospital showed a small round focus within the right lower lung lobe.