<prompt> Retraction of tympanic membrane touching promontory. What is sades grade?1234  <response>: Ans. is c i.e., 3 Atelectic grades of pars tensa Sade classification:: Grade 1 slight retraction of TM over the annulus Grade 2 the TM touches the long process of the incus Grade 3 the TM touches the promontory Grade 4 the TM is adherent to the promontory 