A rare genetic primary immunodeficiency disorder with characteristics of severe congenital neutropenia, bone marrow fibrosis and neutrophil dysfunction which is refractory to granulocyte colony-stimulating factor, manifesting with life-threatening infections and/or deep-seated abscesses, hepato/splenomegaly, thrombocytopenia, hypergammaglobulinemia, anemia with reticulocytosis and nephromegaly. Other reported features include osteosclerosis and neurological abnormalities (for example developmental delay, cortical blindness, hearing loss, thin corpus callosum or dysrhythmia on EEG). Caused by homozygous mutation in the VPS45 gene on chromosome 1q. [from SNOMEDCT_US]