INTRODUCTION
An attic cholesteatoma is a common disease encountered by otologists
because it typically destroys the ossicles, causing several
complications.The traditional treatment method for attic cholesteatoma
is the transoral or retroauricular approach with microscope.
In 1997, after first reporting 36 successful cases of cholesteatoma
removed by endoscope, 1 Tarabichi et al. found an
endoscopic case in which the otology department correctly found its own
position. The main advantage of endoscope widely used in the world is
that it can have a wider and clearer field of vision and destroy less
normal tissues, but its disadvantage is localized attic disease, because
it has not been investigated and studied whether it can replace
microscope treatment in other treatments.2
When studying the subjects in different stages of diseases, the results
of comparative experiments under microscope and endoscope are
inaccurate, and the correctness of the results cannot be guaranteed. The
degree of cholesteatoma can be classified into cholesteatoma of upper
tympanum.3 By comparing the traditional microscope
treatment with endoscopic treatment for cholesteatoma in different
stages, we can evaluate and compare the efficacy of endoscopic ear
surgery (EES).4