title: [Hydatid cyst: another unusual localization].
abstract: We report a case of a 39-year-old woman who presented a right basicervical tumefaction. The chest X rays show a right cervicomediastinal opacity. Ultrasonography and computed tomography failed to describe the nature of the opacity. Because of the strong suspicion of neoplasm or a tuberculosis abscess, a needle aspiration of the cervical mass was performed and surprisingly revealed the presence of a cyst membrane allowing surgical resection.
  
  
  CONCLUSIONS
  Hydatid disease is a likely diagnosis in endemic areas in patients presenting a cystic mediastinal opacity of unknown orign.
authors.affiliation: Service de Pneumologie, Pavillon B, Hôpital de Pneumo-Phtisiologie Abderrahman-Mami, 2080 L'Ariana/Tunis, Tunisie. jamelammar2000@yahoo.fr
authors.forename: J
authors.initials: J
authors.lastname: Ammar
authors.forename: H
authors.initials: H
authors.lastname: Grairi
authors.forename: S
authors.initials: S
authors.lastname: Hammami
authors.forename: S
authors.initials: S
authors.lastname: Hantous
authors.forename: A
authors.initials: A
authors.lastname: Hamzaoui
mesh_terms: D000328:Adult; D004443:Echinococcosis / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008477:Mediastinal Diseases / Q000175:diagnosis* / Q000473:pathology*