Hyperleukocytosis associated pulmonary leukostasis in acute leukaemia.

Leukostasis is a fatal complication in granulocytic leukaemia. Brain and lung are most commonly involved organs in leukostasis. In the lung, the clinical presentation simulates infections and haemorrhagic complications of acute leukaemia. Being a medical emergency, early recognition of leukostasis and initiation of therapy prevents mortality.