Cholesteatoma commonly perforates:
Ans. is a i.e. Lateral semicircular canal Cholesteatoma has the propey to destroy the bone by viue of the various enzymes released by it. Structures immediately at the risk of erosion are: - Long process of incus.deg - Fallopian canal containing facial nerve.deg - Horizontal/lateral semicircular canal.deg
Lat. Semicircular canal
Sup. semicircular canal
Promontory
Oval window