Chronic neutrophilic leukemia presenting as secondary gout: Report of a rare myeloproliferative disorder.

Chronic neutrophilic leukemia is a rare leukemia seen in middle aged and elderly people, characterized by neutrophilic leukocytosis with no significant increase in granulocytic precursors. The chief criteria for diagnosis include total leukocyte count ≥25 × 109/L, >80% of white blood cells being mature neutrophils (segmented and band forms), immature granulocytic precursors ≥10% in the peripheral blood, and hypercellular marrow. In addition to this, there must be no evidence of dysplasia, monocytosis or BCR-ABL1, PDGFR-A, PDGFR-B, or FGRF-1 rearrangements. Moreover, the cause of neutrophilia should not be attributed to any other myeloproliferative disorders or to physiologic neutrophilia.We present two patients with this rare disorder who presented with gout as the initial symptom.