title: Parotid gland solitary fibrous tumor with mandibular bone destruction and aggressive behavior.
abstract: BACKGROUND
  Solitary fibrous tumor is associated with serosal surfaces. Location in the salivary glands is extremely unusual. Extrathoracic tumors have an excellent prognosis associated with their benign clinical behavior. We report an aggressive and recurrent case of this tumor. We review the clinical presentation, inmunohistochemical profiles and therapeutic approaches.
  
  
  METHODS
  A 73-years-old woman presented a mass in her right parotid gland. She had a past history of right superficial parotidectomy due to a neurilemoma. FNAB and magnetic resonance were non-specific. After a tumor resection, microscopic findings were spindled tumor cells with reactivity to CD34, bcl-2 and CD99 and the tumor was diagnosed as Solitary Fibrous Tumor. The patient suffered two recurrences and the tumor had a histological aggressive behavior and a destruction of the cortical bone of the mandible adjacent to the mass. A marginal mandibulectomy with an alveolar inferior nerve lateralization was performed.
  
  
  CONCLUSIONS
  Solitary fibrous tumor is a very rare tumor. Usually, they are benign, but occasionally they can be aggressive. Complete resection is the most important prognostic factor and no evidence supports the efficacy of any therapy different to surgery. Due to the unknown prognosis and to the small number of cases reported, a long-term follow-up is guaranteed. Key words:Solitary fibrous tumor, parotid mass, parotid gland, salivary gland, rare tumors.
authors.affiliation: MD. Department of Oral and Maxillofacial Surgery, Hospital Universitario La Paz, Madrid, Spain.
authors.forename: Estefanía
authors.initials: E
authors.lastname: Alonso-Rodríguez
authors.affiliation: MD. Department of Oral and Maxillofacial Surgery, Hospital Universitario La Paz, Madrid, Spain.
authors.forename: Teresa
authors.initials: T
authors.lastname: González-Otero
authors.affiliation: MD. Department of Otorhinolaryngology, Hospital Universitario La Paz, Madrid, Spain.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Castro-Calvo
authors.affiliation: MD. Department of Pathology, Hospital Universitario La Paz, Madrid, Spain.
authors.forename: Elena
authors.initials: E
authors.lastname: Ruiz-Bravo
authors.affiliation: MD. Department of Oral and Maxillofacial Surgery, Hospital Universitario La Paz, Madrid, Spain.
authors.forename: Miguel
authors.initials: M
authors.lastname: Burgueño