title: Orbital retinoblastoma in an adult.
abstract: OBJECTIVE
  Retinoblastoma is usually seen in children before 5 years of age. We report an unusual case of retinoblastoma in an adult who presented to us with an orbital mass.
  
  
  METHODS
  A 24 year-old-male presented to our centre with a history of protrusion of the right eye for 6 months, and associated loss of vision. Ultrasonography B-scan revealed an intraocular mass with calcification and MRI of the orbits showed extra-ocular spread. An incisional biopsy was taken from the orbital mass.
  
  
  RESULTS
  On biopsy, histopathologic features and immunohistochemical stains were consistent with retinoblastoma.
  
  
  CONCLUSIONS
  To our knowledge, this is the first report of retinoblastoma presenting as an orbital mass in adulthood and highlights the importance of considering this tumour in the differential diagnosis of an intraocular mass with orbital extension in an adult patient.
authors.affiliation: Ocular Oncology Service, Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India. bhavna2424@hotmail.com
authors.forename: Bhavna
authors.initials: B
authors.lastname: Chawla
authors.forename: Maya
authors.initials: M
authors.lastname: Hada
authors.forename: Seema
authors.initials: S
authors.lastname: Kashyap
authors.forename: Sameer
authors.initials: S
authors.lastname: Bakhshi
mesh_terms: D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D001706:Biopsy; D016190:Carboplatin / Q000627:therapeutic use; D003131:Combined Modality Therapy; D005047:Etoposide / Q000627:therapeutic use; D005094:Exophthalmos / Q000175:diagnosis; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009361:Neoplasm Invasiveness; D009918:Orbital Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000628:therapy; D011882:Radiotherapy, High-Energy; D019572:Retinal Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000628:therapy; D012175:Retinoblastoma / Q000473:pathology* / Q000628:therapy / Q000648:ultrastructure; D014463:Ultrasonography; D014750:Vincristine / Q000627:therapeutic use; D055815:Young Adult
chemical_list: D014750:Vincristine; D005047:Etoposide; D016190:Carboplatin