title: Ciliary body neurilemoma. Unusual clinical findings intimating the diagnosis.
abstract: BACKGROUND
  Neurilemomas (schwannomas) rarely occur intraocularly. When present, they pose a diagnostic dilemma for the physician and often are mistaken as a malignant lesion, resulting in enucleation.
  
  
  METHODS
  The authors report the clinical findings of a 46-year-old man with a slowly progressive growing mass of the anterior chamber, associated with glaucoma and the development of cataract. To further delineate the tumor's features, ancillary techniques, including ultrasonography, computed tomography, and magnetic resonance imaging, were conducted. A definitive anterior chamber biopsy of the tumor was performed with histologic examination and electron microscopy.
  
  
  RESULTS
  Ultrasonography, high-resolution computed tomography and magnetic resonance imaging showed a well-delineated mass of the inferior ciliary body involving nearly 5 clock hours of the angle. Two clinical features that suggested a longstanding tumor were brilliant transillumination of the mass (leading to the impression of a "cystic mass," not corroborated by ultrasonography) and retrodisplacement of the involved iris root. The histology, and particularly the electron microscopic features, confirmed the diagnosis of a neurilemoma, a benign tumor of the anterior segment.
  
  
  CONCLUSIONS
  Intraocular neurilemomas are extremely rare tumors. Few are well documented with modern ancillary techniques. Clinical findings in conjunction with radiographic and ultrasonic features may support the diagnosis of a benign tumor. For this patient, confirmation via biopsy permitted combined cataract and glaucoma surgery to rehabilitate the eye, which retains 20/20 visual acuity 3 years after the procedure.
authors.affiliation: Massachusetts Eye and Ear Infirmary, Boston, USA.
authors.forename: R
authors.initials: R
authors.lastname: Pineda
authors.forename: R C
authors.initials: RC
authors.lastname: Urban
authors.forename: A R
authors.initials: AR
authors.lastname: Bellows
authors.forename: F A
authors.initials: FA
authors.lastname: Jakobiec
mesh_terms: D000867:Anterior Chamber / Q000000981:diagnostic imaging / Q000473:pathology; D001706:Biopsy; D002386:Cataract / Q000209:etiology; D002387:Cataract Extraction; D002924:Ciliary Body / Q000000981:diagnostic imaging / Q000473:pathology*; D005901:Glaucoma / Q000209:etiology / Q000601:surgery; D006068:Gonioscopy; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D009442:Neurilemmoma / Q000150:complications / Q000175:diagnosis* / Q000648:ultrastructure; D011859:Radiography; D014463:Ultrasonography; D014604:Uveal Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000648:ultrastructure