Reversible Hearing Impairment Due to Inferior Colliculi Compression by a Pineal Glial Cyst

• DOI: 10.2176/nmccrj.cr.2020-0123
• Publication Date: 2021-03-04T22:09:15Z
• Authors: Yoshifumi MIZOBUCHI; Aki SHIMADA; Kohei NAKAJIMA; Hiroshi KAGUSA; Yasushi TAKAGI
• Keywords: Pons; Inferior Colliculi; Hearing level; Audiogram

Pineal glial cysts associated with bilateral hearing impairment are very rare. Here, we present the case of a 13-year-old boy pineal cyst, which caused severe persisting from 6 years age. When patient was old, acuity about 40 dB on audiometry. Upon admission to our otolaryngology department, his audiogram revealed worsening (80 dB). Magnetic resonance imaging (MRI) an abnormal cyst tectal compression left hardly normal brainstem auditory evoked potentials (BAEPs). We obtained informed consent for exploratory surgery and employed right occipital transtentorial approach removal. Based histological examination, diagnosed gland. At 12 months postoperatively, patient's improved, showing Since pathway has both crossed uncrossed fibers at upper pons midbrain level, lateral lemniscus or inferior colliculus level can cause impairment. In case, there possible slow growth that eventually compressed midbrain, lemniscuses, colliculi side, this led These findings indicate improve in patients progressive