title: Teratoma of the mediastinum: a case report.
abstract: BACKGROUND
  This case report illustrates a rare case of teratoma of the mediastinum which was continuous to the pericardium and caused extrinsic compression to the right atrium.
  
  
  METHODS
  A 22-year-old Caucasian man with no complaints or comorbid conditions presented to our hospital with obliteration of the right cardiophrenic sinus by a mass. A non-invasive investigation demonstrated a tumoral mass which was continuous to the pericardium and caused extrinsic compression to the right atrium. The clinical suspicion was a pericardial or bronchogenic cyst. Surgical and anatomopathologic findings led to the diagnosis of a mature cystic teratoma with atrophic thymic tissue at the external teratoma surface.
  
  
  CONCLUSIONS
  We present an original report of a mature teratoma causing obliteration of the right cardiophrenic sinus with extrinsic heart compression. The diagnosis of this tumor is very difficult through non-invasive investigation.
authors: Department of Atherosclerosis, Heart Institute of the University of São Paulo, Av Dr Eneas de Carvalho Aguiar 44, AB, Sala 114, Cerqueira César, São Paulo-SP, 05403-000, Brazil. mass@incor.usp.br.
authors: Ricardo D
authors: RD
authors: Vieira
authors: Henrique
authors: H
authors: Grimberg
authors: Kiyomi K
authors: KK
authors: Uezumi
authors: Lea Mm
authors: LM
authors: Demarchi
authors: Jeane M
authors: JM
authors: Tsutsui
authors: Neuza Hm
authors: NH
authors: Lopes
authors: Whady
authors: W
authors: Hueb
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