title: Polycythemia in a young patient with chronic renal insufficiency and bilateral hydronephrosis.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005268:Femoral Vein; D006801:Humans; D006869:Hydronephrosis / Q000150:complications*; D007223:Infant; D007676:Kidney Failure, Chronic / Q000150:complications*; D008297:Male; D011086:Polycythemia / Q000209:etiology*; D013927:Thrombosis / Q000209:etiology