Which of the following structures is not at immediate risk of erosion by cholesteatoma ?
Long process of incus
Fallopian canal containing facial nerve
Horizontal/ lateral semicircular canal
Base plate of stapes
Ans. is 'd' i.e., Base plate of stapes Cholesteatoma has the propey to destroy the bone by viue of the enzymes released by it. Structures immediately at the risk of erosion are : - Long process of incus. Fallopian canal containing facial nerve. Horizontal / lateral semicircular canal