Hereditary neutrophilia

Hereditary neutrophilia is an extremely rare genetic hematologic disorder characterized by a chronic, persistent elevation of neutrophil counts in the peripheral blood without an identifiable infectious, inflammatory, or malignant cause. Neutrophils are a type of white blood cell that plays a critical role in the body's immune defense against bacterial and fungal infections. In hereditary neutrophilia, the overproduction of neutrophils is constitutive and present from early life, distinguishing it from reactive (secondary) neutrophilia seen in infections or stress responses. The condition primarily affects the hematopoietic (blood-forming) system. Affected individuals typically present with persistently elevated absolute neutrophil counts, often discovered incidentally on routine blood work. In many reported cases, the condition appears to be clinically benign, with patients remaining largely asymptomatic. However, some individuals may experience hepatosplenomegaly (enlargement of the liver and spleen) due to increased white blood cell turnover or extramedullary hematopoiesis. The bone marrow typically shows granulocytic hyperplasia (increased production of granulocyte precursors) without evidence of dysplasia or malignancy. Because hereditary neutrophilia is generally a benign condition, treatment is usually not required. Management focuses on monitoring blood counts over time and ruling out other causes of persistent neutrophilia, including chronic myeloproliferative neoplasms and leukocyte adhesion deficiency. Genetic counseling is recommended for affected families. No specific targeted therapy exists, and the prognosis is generally favorable. Long-term follow-up is advised to ensure the condition does not evolve into a more serious hematologic disorder.

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