A cochlear implant (CI) is a surgically inserted device that is used for the auditory rehabilitation of adults and children with severe sensorineural hearing loss (SNHL) and/or inadequate speech discrimination who obtain minimal to no benefit from conventional hearing aids [1]. A CI device turns acoustic waves into electric energy, and an intracochlear-placed electrode directly stimulates the spiral ganglion viable cells of the auditory nerve, bypassing the impaired organ of Corti hair cells [2].

The surgical procedure for a cochlear implant involves performing a mastoidectomy combined with posterior tympanotomy to access the round window niche. In routine cerebral CT, the temporal bone may have several morphological aspects that are generally considered normal anatomical variants but can be critical for patients who are candidates for tympanomastoidectomy.