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Maria Rosaria Scala, Pietro Spennato, Antonio Della Volpe, Claudia Santoro, Stefania Picariello, Alfonso Maria Varricchio, Claudio Ruggiero, Serena dé Santi, and Giuseppe Cinalli

The authors present the case of removal of a Koos grade IV right acoustic neuroma in a neurofibromatosis type 2 (NF2) patient, already operated on for left cerebellopontine angle meningioma at 7 years of age and a left acoustic neuroma at 16 years of age. A transpetrosal approach allowed cochlear sensor implantation to detect residual hearing. An enlarged retrosigmoid approach then allowed subtotal microsurgical removal of the lesion; consequently, the authors illustrate the technical nuances of an auditory brainstem implant (ABI). One month after surgery, the ABI was successfully switched on, giving back hearing perception to the patient.

The video can be found here: https://stream.cadmore.media/r10.3171/2021.7.FOCVID2188