MONDO_0009892 (Chuvash polycythemia) can be described as follows. Chuvash erythrocytosis is a rare, genetic, congenital secondary polycythemia disorder characterized by increased hemoglobin, hematocrit and erythropoietin serum levels and normal oxygen affinity, which usually manifests with headache, dizziness, dyspnea and/or plethora. Patients present an increased risk of hemorrhage, thrombosis and early death. Also known as: Chuvash erythromatosis, Chuvash type polycythemia, VHL familial polycythemia, Von Hippel-Lindau-dependent polycythemia, autosomal recessive benign erythrocytosis, erythrocytosis, familial, type 2, familial erythrocytosis 2, familial polycythemia caused by mutation in VHL.