Conjunctiva: Congenital Abnormalities

Question 1

Describe Choristomas?

Answer 1

• Normal tissue which is growing in the wrong place
• Limbal Dermoids
  o Benign
  o Usually located at limbus, encroaching cornea
  o Firm, dome shaped, white, elevations
  o Few mm to 1cm
  o Occur in isolation or as part of congenital syndrome if bilateral – Goldenhar Syndrome
• Surgical excision – if causing any problems – specifically worried about amblyopia in children – want px to have a clear visual axis so they don’t develop amblyopia

Question 2

Describe Dermolipoma?

Answer 2

• Proliferation of normal fat tissue that have in skin
• Benign tumour
• Temporal bulbar conjunctiva
• Yellow-white solid tumour
• Softer than dermoid due to adipose of fat tissue within them
• Extend posteriorly into orbit
• May be associated w/ Goldenhar syndrome
• Avoid tx due to globe extension – they don’t extend onto cornea to obstruct vision
  o The surgery is extensive to remove entire lesion – have to go far back into orbit  further into orbit you go, the more damage you can potentially cause
   Can cause more harm than good
   Can potentially damage other structures in orbit