<prompt> What is sades grade when tympanic membrane is retracted touching promontory1234  <response>: Retraction of Pars Tensa Sades classification Grade 1: Mild retraction not touching the long process of the incus. Grade 2: Retracted drum touching the long process of the incus. Grade 3: Retracted drum touching the promontory. It is also called as middle ear atelectasis. Grade 4: Drum plastered on the promontory. It is also called as adhesive otitis media. Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 79 