Monocytopenia with susceptibility to infections is a rare, genetic, primary immunodeficiency disorder characterized by profound circulating monocytopenia, B- and NK-cell lymphopenia and severe dentritic cell decrease, which manifests clinically with disseminated mycobacterial and viral infections, as well as opportunistic fungal and parasitic infections and frequent pulmonary alveolar proteinosis. Predisposition to developping myeloid neoplasms is associated.