Canal-Wall-Up Tympanomastoidectomy with Facial Recess Dissection Although I personally no longer perform mastoid surgery, I often get asked by patients with cholesteatoma to please clarify what are the differences among the mastoid surgeries proposed by their ear surgeon. Ear anatomy is complex and the surgery to address such a complex area is also not easy to understand. As such, a new webpage has been created to not so much explain what cholesteatoma is (a destructive cyst-like skin…