Paediatric ophthalmology: Case ten

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This 2 year-old presented to the ophthalmologist with the above facial appearance. There was no history of trauma and the blood test including clotting screen was normal.

a. What is the differential diagnosis?

b. Further examination revealed bilateral proptosis. What is the most likely diagnosis?

c. What other ocular signs may occur with the condition mentioned in b.?

d. What is the prognosis for this patient?