Most common site involved in Otosclerosis is

(A) Foot plate stapes # Stapedial Otosclerosis:> Stapedial otosclerosis causing stapes fixation and conductive deafness is the most common variety.> Here lesion starts just in front of the oval window in an area call 'fissula ante fenestram'.> This is the site predilection (anterior focus).> Lesion may be behind the oval window (posterior focus), around the margin of the stapes foot plate (circumferential), in the foot plate but annular ligament being free (biscuit type).> Sometimes, may completely obliterate the oval window niche (obliterative type).