title: [Erythrocytosis and hydronephrosis in a horseshoe kidney].
abstract: OBJECTIVE
  To report a case of erythrocytosis in a patient with a hydronephrotic horseshoe kidney and normal erythropoietin values.
  
  
  RESULTS
  A hydronephrotic horseshoe kidney was discovered during evaluation to determine the etiology of the erythrocytosis in a 23-year-old male with normal erythropietin values. Blood parameters returned to normal following heminephrectomy. The hydronephrosis had been caused by stenois of the pyeloureteric junction.
  
  
  CONCLUSIONS
  Although erythropoietin values may be normal, hydronephrosis can cause secondary erythrocytosis.
authors.affiliation: Servicio de Urología, Hospital de la Merced, Osuna, Sevilla, España.
authors.forename: J A
authors.initials: JA
authors.lastname: Valero Puerta
authors.forename: F J
authors.initials: FJ
authors.lastname: Jiménez Gonzalo
authors.forename: M
authors.initials: M
authors.lastname: Medina Pérez
authors.forename: I
authors.initials: I
authors.lastname: Valpuesta Fernández
authors.forename: M
authors.initials: M
authors.lastname: Sánchez González
authors.forename: L
authors.initials: L
authors.lastname: López Rodríguez
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D004921:Erythropoietin / Q000097:blood; D006801:Humans; D006869:Hydronephrosis / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery; D007668:Kidney / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D052177:Kidney Diseases, Cystic / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D011086:Polycythemia / Q000175:diagnosis / Q000209:etiology*; D011087:Polycythemia Vera / Q000175:diagnosis; D014057:Tomography, X-Ray Computed
chemical_list: D004921:Erythropoietin
vernacular_title: Poliglobulia e hidronefrosis, en riñón en herradura.