title: [Retroperitoneal paraganglioma].
abstract: OBJECTIVE
  To report the radiological findings of retroperitoneal paragangliomas.
  
  
  METHODS
  A patient who presents with colic pain and undergoes intravenous urography and CT scan.
  
  
  RESULTS
  KUB x-ray revealed an increase of radiodensity on the left flank. The urography showed a partially obstructive urinary lithiasis in the proximal third of the left ureter with a mass effect laterally displacing pelvis and ureter. The study was completed with an i.v. contrast abdominal CT scan which showed a left para-aortic solid mass under the kidney with heterogeneous contrast uptake.
  
  
  CONCLUSIONS
  The correlation of symptoms and catecholamine levels is the best way to guide the etiological diagnosis after CT scan.
authors.affiliation: Departamento de Diagnóstico por la imagen, Institut Universitario Dexeus-USP, Barcelona, España. 33829mmg@comb.es
authors.forename: Montserrat
authors.initials: M
authors.lastname: Monzón
authors.forename: Jesús
authors.initials: J
authors.lastname: Ares
authors.forename: Carlos
authors.initials: C
authors.lastname: Traid
authors.forename: Belén
authors.initials: B
authors.lastname: Ubeda
authors.forename: Ana
authors.initials: A
authors.lastname: Roma
authors.forename: Ramón
authors.initials: R
authors.lastname: Rotger
authors.forename: Angel
authors.initials: A
authors.lastname: Palacio
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D010235:Paraganglioma / Q000000981:diagnostic imaging*; D011859:Radiography; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging*