title: [Recurrence of peripheral primitive neuroectodermal tumor of the orbit with systemic metastases].
abstract: METHODS
  A six-year-old boy presented with proptosis of the right eye. Imaging studies detected a mass in the medial wall of the right orbit. This mass was biopsied revealing a histopathologic diagnosis of primitive neuroectodermal tumor, so chemotherapy treatment was given. After seven years in remission he presented with a recurrence of the orbital tumor and was found to also have systemic metastases. Treatment with chemotherapy, radiotherapy and orbital exenteration was unsuccessful.
  
  
  CONCLUSIONS
  The orbital occurrence of these tumors is extremely rare. Differentiation from other small round cell tumors requires immunohistochemical and ultrastructural techniques.
authors.affiliation: Sección de Oftalmología Infantil, Hospital Universitario La Paz, Madrid, España. romeromartinricardo@hotmail.com
authors.forename: R
authors.initials: R
authors.lastname: Romero
authors.forename: J
authors.initials: J
authors.lastname: Abelairas
authors.forename: J
authors.initials: J
authors.lastname: Sanz
authors.forename: M M
authors.initials: MM
authors.lastname: Ruiz
authors.forename: E
authors.initials: E
authors.lastname: Sendagorta
mesh_terms: D002648:Child; D006801:Humans; D008297:Male; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis*; D018241:Neuroectodermal Tumors, Primitive, Peripheral / Q000175:diagnosis* / Q000556:secondary*; D009918:Orbital Neoplasms / Q000175:diagnosis* / Q000473:pathology*