Most common cause of unilateral proptosis is-: (A) Thyrotoxicosis, (B) Retinoblastoma, (C) Intraocular haemorrhage, (D) Raised intracranial tension
Answer is A. *Thyroid orbitopathy is the most common cause of bilateral and unilateral proptosis. Ref: Head & Neck surgery 2nd/e p.1513