Most common site for initiation of stapedial otosclerosis is:: (A) Fissula ante-fenestram, (B) Fossula post-fenestram, (C) Footplate of stapes, (D) Margins of stapes
Answer is A. Most common site for otosclerosis to start is fissula ante-fenestram - an area lying in front of oval window. Other sites listed in the question are also affected but their involvement is less frequent.