Unilateral conductive hearing loss in a patient with history of head injury. On examination, tympanic membrane is normal and mobile. The cause for deafness could be: (A) Collection of fluid in the middle ear, (B) Otosclerosis, (C) Dislocation of the incudostapedial joint, (D) ASOM
Answer is C. Acquired causes of conductive hearing loss include: Perforation of tympanic membrane Fluid in the middle ear-acute otitis media, serous otitis media, hemotympanum Mass in the middle ear (benign/malignant) Disruption of ossicles-trauma to ossicular chain, CSOM, cholesteatoma Fixation of ossicles-otosclerosis, tympanosclerosis Eustachian tube blockage