Catastrophic cerebral sinovenous thrombosis with haemorrhagic conversion in a new diagnosis of paediatric acute myelogenous leukaemia

A previously healthy 14-month-old boy with 5 days of cough, rhinorrhea, diarrhoea and fever to 38.9°C was admitted to an outside hospital with altered mental status, intermittent bradycardia and hypertension, but otherwise a normal physical examination. A complete blood count (CBC) revealed