Most Common site of perilymph fistula is
Round window
Oval window
Otic capsule
Attic
In this condition perilymph leaks into the middle ear. Footplate of stapes is fixed on oval window. It can occur as a complication of stapedectomy, or ear surgery when stapes is dislocated, and also from sudden pressure change in the middle ear. (Ref: Diseases of EAR, NOSE AND THROAT by PL DHINGRA - 6th Edition)
Ear