A 4-year-old girl is brought by her parents to hospital with a history of pallor, bruising and lethargy. On examination, she has a temperature of 38 °C, heart rate 110 Beat per minute, BP 100/60. She is pale, and has multiple bruises over her arms and legs. She has extensive lymphadenopathy. Cardiovascular and respiratory examinations are within normal limits. She has 4 cm hepatomegaly, and 3 cm splenomegaly. A full blood count shows:
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