Auditory perception after cochlear implant was assessed in a woman with profound acquired sensory hearing impairment in both ears. At 20 years of age, she was affected by mumps, causing hearing loss in her right ear with thresholds at 100 dB for all frequencies without speech detection. Ten years later, she experienced hearing loss in her left ear accompanied by dizziness and tinnitus and was diagnosed with an acoustic neuroma on imaging analysis. She underwent cochlear implant surgery in the right ear, which was activated after 30 days. During activation, the patient reported not being able to hear with the implant. Within 1 h of activation, she was able to hear. She returned after 7 days of implant use and achieved a free-field threshold of 40 dB at a frequency of 500 Hz and 20 dB at frequencies of 2000, 3000, and 4000 Hz. She could discriminate 50% of words presented.