title: [Primary synovialosarcoma: a case of unusual location].
abstract: OBJECTIVE
  Report a new case of primary Synovialosarcoma.
  
  
  METHODS
  We report a case of a 16 year old girl, who presented with a tumefaction on the right clavicle evolving for 3 months. Various explorations carried out, in particular thoracic scanner and imagery by magnetic resonance, showed a multilocular cystic formation of the seat and the clavicle reaching the mediastinum. A pathological examination of the part (piece) highlighted a biphasic synovialosarcoma of grade III. This diagnosis was validated by the immunohistochemistry study and the detection of transcribed specific fusion of the synovialosarcoma, SYT-SSX1.
  
  
  CONCLUSIONS
  The unusual locations of the primitive SS must be known because the diversity of their microscopic aspects may cause confusion in the diagnosis. The immunohistochemistry, and more recently the cytogenetic studies, helps to solve these problems of differential diagnosis.
authors.affiliation: Service d'Anaromie et de Cvrologie Pathologiques, Hôpital la Rabta.
authors.forename: Samia
authors.initials: S
authors.lastname: Chatti-Dey
authors.forename: Essia
authors.initials: E
authors.lastname: Saïji
authors.forename: Yossra
authors.initials: Y
authors.lastname: Zidi-Mouaffak
authors.forename: Ehsen
authors.initials: E
authors.lastname: Ben Brahim-Negra
authors.forename: Samir
authors.initials: S
authors.lastname: Ben Slimane
authors.forename: Monia
authors.initials: M
authors.lastname: Tangour
authors.forename: N
authors.initials: N
authors.lastname: Meddeb
authors.forename: M
authors.initials: M
authors.lastname: Maamouri
mesh_terms: D000293:Adolescent; D002968:Clavicle; D003964:Diaphragm; D005260:Female; D006801:Humans; D013584:Sarcoma, Synovial / Q000473:pathology*; D012983:Soft Tissue Neoplasms / Q000473:pathology*; D013899:Thoracic Neoplasms / Q000473:pathology*