title: [Renal extramedullary hematopoiesis. Case report].
abstract: Extramedullary hematopoiesis (EMH) is defined as the formation and development of erythrocytic, granulocytic and megakaryocytic cell lines outside the bone marrow; it is a rare occurrence, which is limited to case reports.
  
  
  OBJECTIVE
  To describe a case of renal EMH secondary to chronic hypoxia.
  
  
  METHODS
  The patient is a 16 year old teenager who developed chronic hypoxia, central cyanosis, clubbing and lives more than 2,500 m above sea level. Chronic hypoxia is probably secondary to pulmonary hypertension, neither detected nor previously treated. The Consultation was due to a mass in the left upper quadrant for the last three months. An Echocardiogram showed pulmonary hypertension that could not be assessed by hemodynamic parameters. A computed tomography showed bilateral left renal pelvic masses. The hemogram showed polycythemia, so bone marrow aspiration was performed, which rule out malignant pathology. A biopsy of the renal mass reported EMH with three hematopoietic cell lines.
  
  
  CONCLUSIONS
  This EMH case is a response to chronic hypoxia rather than to a bone marrow lesion as it has usually been described.
authors.forename: Diana Vanessa
authors.initials: DV
authors.lastname: Suárez A
authors.forename: María
authors.initials: M
authors.lastname: Del Rosario Alvarez V
authors.forename: Juan Pablo
authors.initials: JP
authors.lastname: Rojas H
mesh_terms: D000293:Adolescent; D001706:Biopsy; D002908:Chronic Disease; D006411:Hematopoiesis, Extramedullary / Q000502:physiology*; D006801:Humans; D006976:Hypertension, Pulmonary / Q000150:complications*; D000860:Hypoxia / Q000150:complications* / Q000209:etiology; D008297:Male; D014057:Tomography, X-Ray Computed