title: [Infraorbital schwannoma. Case report].
abstract: BACKGROUND
  Infraorbital schwannoma is a benign tumor of the peripheral nerve seath composed of Schwann cells. Usually occurs between 20 and 70 years of age, are usually asymptomatic and can cause progressive, painless proptosis during growth.
  
  
  METHODS
  A 32-year-old male admitted to ophthalmologic hospital with a painless, slowly progressive mass above the left lacrimal sac. At the ophthalmologic examination the tumor had a rubbery consistency and was firmly attached to the surrounding structures. The transillumination was negative. The B mode ultrasound disclosed a phakic eye as well as an infraorbital well-circumscribed homogeneous mass with a largest diameter of 19.7 mm, without involvement of the lacrimal pathway. The A mode ultrasound showed medium-high reflectivity with small internal vascularity. The computed tomography showed a homogeneous wellcircumscribed solid mass anterior and inferior to the left globe without bony erosion. Through subdermic incision the mass was excised. The histopathological diagnosis was "Infraorbital schwannoma".
  
  
  CONCLUSIONS
  The schwannoma is a rare benign tumor in the orbit, few cases have been reported. The definitive diagnosis is made by histopathologic findings as the presence of a true capsule, hyper-and hypocellular areas, thickening and hyalinization of the vessel walls. When these findings are not be confused with benign fusocellular tumors. We report a new case of infraorbital schwannoma and compared it with those cases previously reported.
authors.affiliation: Servicio de Órbita, Oculoplástica y Vías Lagrimales,Asociación para Evitar la Ceguera en México, IAP, Hospital Dr. Luis Sánchez Bulnes, México, DF, Mexico.
authors.forename: Laura Evelyn
authors.initials: LE
authors.lastname: Mora-Ríos
authors.affiliation: Servicio de Patología Oftálmica, Asociación para Evitar la Ceguera en México, IAP. Hospital Dr. Luis Sánchez Bulnes, México, DF, Mexico.
authors.forename: Dolores
authors.initials: D
authors.lastname: Ríos Y Valles-Valles
authors.affiliation: División de Investigación, Hospital Juárez de México, DF. Mexico.
authors.forename: José Javier
authors.initials: JJ
authors.lastname: Flores-Estrada
authors.affiliation: Servicio de Patología Oftálmica, Asociación para Evitar la Ceguera en México, IAP. Hospital Dr. Luis Sánchez Bulnes, México, DF, Mexico. arodri2@yahoo.com.
authors.forename: Abelardo Antonio
authors.initials: AA
authors.lastname: Rodríguez-Reyes
mesh_terms: D000328:Adult; D003390:Cranial Nerve Neoplasms / Q000175:diagnosis* / Q000601:surgery / Q000648:ultrastructure; D006801:Humans; D008297:Male; D008442:Maxillary Nerve / Q000473:pathology*; D009442:Neurilemmoma / Q000175:diagnosis* / Q000601:surgery; D009918:Orbital Neoplasms / Q000175:diagnosis* / Q000601:surgery; D014057:Tomography, X-Ray Computed; D014172:Transillumination
keywords: Schwannoma; infraorbital nerve; nervio infraorbitario; orbital tumor; tumor orbitario