A 29-year-old man presents with fever, bruising and aching in the long bones. He has pallor, scattered petechiae and a spleen palpable 2 cm below the costal margin. His haemoglobin is 76 g/L (135–180), platelet count 24 × 10^9/L (150–400) and white cell count 38 × 10^9/L (4–11). The blood film contains numerous blasts, some with slender azurophilic cytoplasmic inclusions, but no previous abnormal blood counts are available. Which one of the following is the most likely diagnosis?
Keep going — a set of ten like this one, one at a time.
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