Most common site for the initiation of otosclerosis is -

Most common type of otosclerosis – Stapedial otosclerosis Most common site of otosclerosis – Fissula ante fenestram (i.e. just in front of oval window) Most common site for stapedial otosclerosis – Fissula ante fenestram (i.e. just in front of oval window) Most common site for cochlear otosclerosis – Round window Ref. Dhingra 5/e, p 97-98, 6/e, p 86-87