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Classification of all cholesteatomas based on pathogenesis
| Initial Location | Clinical History | Status of TM (if middle ear) | |
|---|---|---|---|
| Congenital (2%)a | Anywhere in the temporal bone | No history | Intact |
| Acquired | Middle ear | Recurrent ear disease | |
| Primary (80%)a | Apparently intact | ||
| Secondary (18%)a | Perforated |
The percentage refers to the distribution of cholesteatomas in the middle ear.
