Staging system for attic cholesteatoma
According to the EAONO/JOS 2015,4 the attic
cholesteatoma was classified as follows:
Cholesteatoma in attic (stage I), epithelial shrink bag self-cleaning
function (stage Ia), continuous accumulation of shrink bag
keratin-debris (stage Ib), cholesteatoma involving two or more websites
(stage II), intratemporal complications and/or pathological conditions
of cholesteatoma (stage III), and intracranial cholesteatoma
complications (stage IV).