Key Points:
1. Endoscope surgery quickly developed in otology, but pitfuls emerge.
2. Lost of the depth perception during surgery can lead to servere complications.
3. Stapes punched in to vestibule cavity caused total hearing loss.
4. Persist to paroxymal vertigo were developed due to the free-flow stapes.
5. Vestibular function recovered after removed the stapes from vestibule cavity.