<prompt> Which of the following structures is not at immediate risk of erosion by cholesteatoma?Long process of incusFallopian canal containing facial nerveHorizontal semicircular canalBasal plate of stapes  <response>: Cholesteatoma has the propey to destroy the bone by viue of the enzymes released by it.Structures immediately at the risk of erosion are:-The long process of the incusFallopian canal containing facial nerveHorizontallateral semicircular canalRef: PL Dhingra, Diseases of Ear, Nose Throat, 7th edition, pg no. 73 - 74 