A patient with acute cardiorespiratory failure caused by hyperleukocytosis due to chronic lymphocytic leukaemia (CLL) is described. Although acute pulmonary failure due to leukostasis is a known and often postmortem finding in patients with acute myelocytic leukaemia (AML) or chronic myelocytic leukaemia (CML) in blastic crises, it is rare in CLL.
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