You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Nerve damaged in radical mastoidectomy is - and explain in detail?
Complications of radical mastoidectomy

Injury to facial nerve
Dislocation of incus
Injury to horizontal semicircular canal. The patient will have post-operative giddiness and nystagmus.
Injury to sigmoid sinus with profuse bleeding.
Injury to the dura of middle cranial fossa.