In otosclerosis Carhart's notch dips at:: (A) 1000 Hz in AC, (B) 1000 Hz in BC, (C) 2000 Hz in AC, (D) 2000 Hz in BC
Answer is D. (d) 2000HzinBC(Ref. Shambaugh, 6th ed., 532)In otosclerosis the dip at 2000Hz is seen in bone conduction curve which is known as Carhart's notch. Mnemonic: Carhart's in Bone Conduction, CBC.