Bone marrow neoplastic
Bone marrow - neoplastic myeloid
Myeloproliferative neoplasms (MPN)
Chronic neutrophilic leukemia

Topic Completed: 1 August 2011

Minor changes: 22 March 2021

Copyright: 2002-2021,, Inc.

PubMed Search: Chronic neutrophilic leukemia [title]

Nikhil Sangle, M.D.
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Cite this page: Sangle N. Chronic neutrophilic leukemia. website. Accessed June 20th, 2021.
Definition / general

Bone marrow:
  • Hypercellular with granulocyte hyperplasia, predominantly segmented and band neutrophils
  • Variable erythroid and megakaryocyte hyperplasia; no/minimal dysplastic changes
  • No increased myeloblasts
WHO 2008:
  • ≥ 25 × 109 WBC in peripheral blood, with > 80% segmented neutrophils or bands, < 10% immature granulocytes and < 1% myeloblasts ( < 5% blasts in the bone marrow)
  • No cause for reactive neutrophilia
  • Demonstration of clonal status of the granulocytes
  • Hepatosplenomegaly
  • No rearrangement of PDGFRA, PDGFRB or FGFR1
  • No BCR-ABL
  • No dyserythropoiesis, no granulocyte dysplasia, no monocytosis
  • No other myeloproliferative disorder (Ann Hematol 2008;87:1)
  • Increased WBC count > 25 × 109/L with neutrophilia, increased serum vitamin B12
Case reports
  • Optimal treatment unknown
Microscopic (histologic) description
  • Bone marrow: hypercellular with granulocyte hyperplasia, predominantly segmented and band neutrophils; variable erythroid and megakaryocyte hyperplasia; no / minimal dysplastic changes; no increased myeloblasts
Microscopic (histologic) images

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Bone marrow smear:

Neutrophils at various maturational states

Molecular / cytogenetics description
  • 90% normal, also +8, 20q-
Differential diagnosis
  • CML with p230 variant BCR-ABL fusion transcript and mature peripheral blood neutrophils should be considered as CML (Cancer 2002;94:2416)
  • Myeloma or other neoplasms that secrete G-CSF or other cytokines may be associated with chronic neutrophilic leukemia but must demonstrate clonal granulocytes to establish the diagnosis (Am J Hematol 2005;80:243)
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