Cholesteatoma commonly perforates:: (A) Lat. Semicircular canal, (B) Sup. semicircular canal, (C) Promontory, (D) Oval window
Answer is A. 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