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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