Sadé Grading System of Atelectasis
Sadé Grade 1
Slight retraction of the tympanic membrane
Sadé Grade 2
Tympanic membrane is retracted onto the incus or incudostapedial joint
Sadé Grade 3
Tympanic membrane is retracted onto the promontory
Sadé Grade 4
Tympanic membrane is retracted to the promontory with formation of adhesions and/or is incompletely visualized or there is accumulation of keratin debris within retraction pocket
Sadé Grade 5
Atelectatic tympanic membrane is perforated
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