Case Study: February 2013


  • 10 year old male
  • Foreign body sensation
  • On examination-some hyperaemia of the left bulbar conjunctiva
  • Firm mass, beneath supero-temporal bulbar conjunctiva
  • Excised


  1. What is seen in the figures?
  2. What is the diagnosis?
  3. What is unusual about the history?
Click to show answers
  1. Mature, compact bone
  2. Epibulbar osseous choristoma
  3. The lesion is commoner in females and rarely presents with a foreign body sensation


Boniuk M, Zimmerman LE. Episcleral osseous choristoma. Am J Ophthalmol. 1961: 53: 290-296.