A 26 years old male with restriction of eye movements in all directions and moderate ptosis but with no Diplopia or squint. Diagnosis is: (A) Thyroid ophthalmopathy, (B) Chronic progressive external ophthalmoplegia, (C) Myasthenia gravis, (D) Multiple cranial nerve palsies
Answer is B. Ans. (b) Chronic progressive external ophthalmoplegiaRef: Kanski 7/e, p. 852Restriction of ocular movement in both eyes are symmetrical in chronic progressive external ophthalmoplegia, so there is no diplopia.