Neutropenia is not a leukaemia.
Neutropenia is a reduction in absolute peripheral blood neutrophils, and there may be a reduction in granulocyte lineage stem cells in the bone marrow, while the red lineage stem cells that will differentiate into red blood cells in the future, and the megakaryocyte lineage stem cells that will differentiate to produce platelets in the future, are generally not significantly altered.
The main clinical manifestation of neutropenia is an increased risk of infection. Mild to moderate agranulocytic deficiency usually improves or recovers with the removal of the cause and symptomatic treatment.
Leukaemia is a group of haematopoietic stem cell malignancies in which leukaemic cells proliferate and accumulate in the bone marrow and other haematopoietic tissues, inhibiting normal haematopoiesis and often presenting with varying degrees of anaemia, bleeding, infection and enlarged lymph nodes.