Abstract
Leukocytosis is defined as leukocyte count ≥13 × 109/L; in this chapter, the focus is leukocytosis due to an increase of neutrophils and their precursors. Thrombocytosis is defined by a platelet count ≥450 × 109/L. Leukocytosis either in isolation or as the main abnormal feature of blood is discussed in Chap. 5, whereas thrombocytosis as the primary presenting abnormality is discussed in Chap. 8. This chapter covers conditions presenting with either leukocytosis or thrombocytosis and one or two cytopenias. As well as reactive conditions that may present with this mixed picture in the blood, specific myeloid neoplasms most commonly present with mixed cytosis and cytopenias are discussed here: atypical chronic myeloid leukemia; myelodysplastic syndrome/myeloproliferative neoplasm (MDS/MPN), unclassifiable; and primary myelofibrosis. A proposed algorithmic approach to the diagnosis of neutrophilic leukocytosis accompanied by anemia and/or thrombocytopenia is shown in Fig. 10.1. Myelodysplastic syndromes with isolated del(5q) and with inv(3) that can frequently present with thrombocytosis despite other cytopenias will also be discussed. The MDS/MPN entity with ring sideroblasts and thrombocytosis, although most classically presenting with thrombocytosis and anemia, is discussed separately in Chap. 8.
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Loghavi, S., Wang, S.A. (2018). Mixed Cytoses and Cytopenias. In: Wang, S., Hasserjian, R. (eds) Diagnosis of Blood and Bone Marrow Disorders. Springer, Cham. https://doi.org/10.1007/978-3-319-20279-2_10
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