Radical mastoidectomy includes all except:
Ans. C Cochlea removedExplanationRadical mastoidectomy is a procedure to eradicate disease from middle ear and mastoid without any attempt to reconstruct hearing.It is rarely done these days - Its only indications are:- Malignancy of middle ear- When cholesteatoma cannot be removed safely eg if it invades eustachian tube, round window or perilabrynthine cellsIf previous attempts to eradicate cholesteatoma have failedFollowing steps are done in radical mastoidectomy:Posterior meatal wall is removed and the entire area of middle ear, attic, antrum and mastoid is conveed into a single cavity, by removing the bridege and lowering the facial ridge.All remnants of tympanic membrane, ossicles (except the stapes foot plate) and mucoperiosteal lining are removed (Not cohlea)Eustachian tube is obliterated by a piece of muscle or cailageThe diseased middle ear and mastoid are permanently exteriorised for inspection and cleaning.Remember: Bridge is the most posterosuperior pa of bony meatal wall lateral to aditus and anturm, which overlies the Notch of Rivinus while facial ridge lies lateral to fallopian canal. Bridge is removed and ridge is lowered in radical or modified radical operation.
Closure of the auditory tube
Ossicles removed
Cochlea removed
Exteriorisation of mastoid