MONDO_0009891 (acquired polycythemia vera) can be described as follows. Polycythemia vera (PV) is an acquired myeloproliferative disorder characterized by an elevated absolute red blood cell mass caused by uncontrolled red blood cell production, frequently associated with uncontrolled white blood cell and platelet production. Also known as: Osler-Vaquez disease, Osler-Vaquez syndrome, PV, Vaquez disease, acquired primary erythrocytosis, polycythaemia rubra vera, polycythemia rubra vera, polycythemia vera.