Liquefaction (Hydrolytic) Necrosis from a Hearing Aid Battery in the Ear Canal (Assault and Battery in the Ear Canal)
In this case report, SR is an 84-year-old woman presenting with a no. 312 hearing aid battery that had been in her right ear canal for several weeks. This is a situation that can lead to liquefaction (hydrolytic) necrosis.
SR’s initial audiological examination was in January 2010 and her primary complaint was an inability to recognize conversations in most listening situations. Pure-tone audiometry revealed a bilateral symmetrical mild to severe sensorineural hearing loss that is gradually sloping in configuration. Speech recognition thresholds (SRTs) revealed a moderate loss in the ability to receive speech bilaterally. Word recognition scores (WRSs) using full-list recordings of the Northwestern University Auditory Test No. 6 (NU-6) word lists revealed a slight loss in the ability to receive speech bilaterally. Tympanograms revealed normal ear canal volume and static compliance , as well as normal middle ear pressure. Contralateral and ipsilateral acoustic reflex thresholds (ARTs) at 1000 Hz were normal (