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Superior canal dehiscence syndrome (SCDS) is a rare medical condition of the inner ear, leading to hearing and balance symptoms in those affected. The symptoms are caused by a thinning or complete absence of the part of the temporal bone overlying the superior semicircular canal of the vestibular system. There is evidence that this rare defect, or susceptibility, is congenital.〔(The Hopkins Gazette Mar. 8, 1999 VOL. 28, NO. 25 Melissa Murray: Old Bone Collection Reveals Basis for Some Dizziness )〕〔(Hopkins Medical News (1999) Jim Duffy: The Clue in the Old Bones )〕 There are also numerous cases of symptoms arising after physical trauma to the head. It was first described in 1998 by Dr. Lloyd B. Minor of Johns Hopkins University, Baltimore, USA. == Symptoms == Superior canal dehiscence (SCD) can affect both hearing and balance to different extents in different people. Symptoms of SCDS include: * Autophony – person's own speech or other self-generated noises (e.g. heartbeat, eye movements, creaking joints, chewing) are heard unusually loudly in the affected ear * Dizziness/ vertigo/ chronic disequilibrium caused by the dysfunction of the superior semicircular canal * Tullio phenomenon – sound-induced vertigo, disequilibrium or dizziness, nystagmus and oscillopsia * Pulse-synchronous oscillopsia * Hyperacusis – the over-sensitivity to sound * Low-frequency conductive hearing loss * A feeling of fullness in the affected ear * Pulsatile tinnitus * Brain fog * Fatigue * Headache/migraine * Tinnitus – high pitched ringing in the ear 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Superior canal dehiscence」の詳細全文を読む スポンサード リンク
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