The common cavity deformity (CCD) of the inner ear is characterized by cochlea and vestibule forming a single cavity. It indicates cochlear implantation (CI) and about 15% to 25% of inner ear malformation. However, complications such as facial nerve injury, penetration of the electrode array into the internal auditory canal (IAC) and electrode displacement are common, leading to unsatisfied outcomes. This book describes the embryology of CCD, preoperative auditory, balance and vestibular evaluation, and electrophysiology and radiology aspect for CCD. In addition, the surgical technique and CI outcomes will be focused. The electrode array design is also a highlight for CCD surgery, and will be discussed in details. Last but not least, the balance and vestibular function research of CCD patients before and after surgery is also thoroughly reviewed. It will be a good reference for otologist and practitioners in related field to understand more about CCD.

The common cavity deformity (CCD) of the inner ear is characterized by cochlea and vestibule forming a single cavity. It indicates cochlear implantation (CI) and about 15% to 25% of inner ear malformation. However, complications such as facial nerve injury, penetration of the electrode array into the internal auditory canal (IAC) and electrode displacement are common, leading to unsatisfied outcomes. This book describes the embryology of CCD, preoperative auditory, balance and vestibular evaluation, and electrophysiology and radiology aspect for CCD. In addition, the surgical technique and CI outcomes will be focused. The electrode array design is also a highlight for CCD surgery, and will be discussed in details. Last but not least, the balance and vestibular function research of CCD patients before and after surgery is also thoroughly reviewed. It will be a good reference for otologist and practitioners in related field to understand more about CCD.

Having been found in 3%-21% patients with congenital sensorineural deafness, cochlear nerve deficiency (CND) is defined by a small or absent cochlear nerve. This book describes the updated information on the embryology, pre- and post- operative auditory, electrophysiology and vestibular aspects of CND. What's more, the cochlear implantation (CI) strategy and CI outcomes as well as comparison with normal patients will be discussed in details with selected cases and high resolution illustrations. It will be a valuable reference for otologists, audiologists and practitioners who would like to understand more about CND and choose optimal clinical strategy of CI surgery for CND.