Myeloproliferative Disorders [Disease/Finding] Polycythemia Vera [Disease/Finding] C5086 Polycythemia Vera A myeloproliferative disorder of unknown etiology, characterized by abnormal proliferation of all hematopoietic bone marrow elements and an absolute increase in red cell mass and total blood volume, associated frequently with splenomegaly, leukocytosis, and thrombocythemia. Hematopoiesis is also reactive in extramedullary sites (liver and spleen). In time myelofibrosis occurs. 109992005 N0000002454 Polycythemia Rubra Vera 1023815 M0017168 Polycythemia Vera C0032463 Osler-Vaquez Disease D011087 Erythremia