Leukostasis

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Definitions
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List of terms related to Leukostasis

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Leukostasis (aka symptomatic hyperleukocytosis) is a white blood cell count above 100,000/μL. It is characterized by abnormal intravascular leukocyte aggregation and clumping. It is most often seen in leukemia patients. The brain and lungs are the two most commonly affected organs. Occluded microcirculation causes local hypoxemia and hemorrage manifesting as headache, blurred vision, transient ischemic attacks, cerebrovascular accidents and dyspnea. It is an acute syndrome requiring aggressive cytoreductive modalities including chemotherapy and/or leukapheresis to both reduce the number of circulating leukocytes and to break apart any aggregates that have already formed. It is different from leukemic infiltration which is a neoplastic process where leukemic cells invade organs.