Light cupula of the horizontal semicircular canal occurring alternately on both sides: a case report

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• 作者：Jung Eun Shin (1)
  Chang-Hee Kim (1)
  
  1. Department of Otorhinolaryngology-Head and Neck Surgery ; Konkuk University Medical Center ; Konkuk University School of Medicine ; 120-1 Neungdong-ro (Hwayang-dong) ; Gwangjin-gu ; Seoul ; 143-729 ; Republic of Korea
  
• 关键词：Direction ; changing positional nystagmus ; Light cupula ; Head ; roll test ; Positional vertigo
• 刊名：BMC Ear, Nose and Throat Disorders
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：15
• 期：1
• 全文大小：512 KB
• 参考文献：1. Kim, CH, Kim, MB, Ban, JH (2014) Persistent geotropic direction-changing positional nystagmus with a null plane: the light cupula. Laryngoscope 124: pp. E15-19 CrossRef
  2. Ichijo, H (2012) Persistent direction-changing geotropic positional nystagmus. Eur Arch Otorhinolaryngol 269: pp. 747-751 CrossRef
  3. Bergenius, J, Tomanovic, T (2006) Persistent geotropic nystagmus鈥揳 different kind of cupular pathology and its localizing signs. Acta Otolaryngol 126: pp. 698-704 CrossRef
  4. Hiruma, K, Numata, T (2004) Positional nystagmus showing neutral points. ORL J Otorhinolaryngol Relat Spec 66: pp. 46-50 CrossRef
  5. Hiruma, K, Numata, T, Mitsuhashi, T, Tomemori, T, Watanabe, R, Okamoto, Y (2011) Two types of direction-changing positional nystagmus with neutral points. Auris Nasus Larynx 38: pp. 46-51 CrossRef
  6. Kim, CH, Choi, JM, Jung, HV, Park, HJ, Shin, JE (2014) Sudden sensorineural hearing loss with simultaneous positional vertigo showing persistent geotropic direction-changing positional nystagmus. Otol Neurotol 35: pp. 1626-1632 CrossRef
  7. Kim, CH, Shin, JE, Shin, DH, Kim, YW, Ban, JH (2014) 鈥淟ight cupula鈥?involving all three semicircular canals: a frequently misdiagnosed disorder. Med Hypotheses 83: pp. 541-544 CrossRef
  8. Bisdorff, AR, Debatisse, D (2001) Localizing signs in positional vertigo due to lateral canal cupulolithiasis. Neurology 57: pp. 1085-1088 CrossRef
  9. Ichijo, H (2012) Is horizontal semicircular canal ocular reflex influenced by otolith organs input?. Acta Otolaryngol 132: pp. 715-719 CrossRef
  
• 刊物主题：Otorhinolaryngology; Internal Medicine;
• 出版者：BioMed Central
• ISSN：1472-6815

文摘

Background The light cupula is a condition wherein the cupula of the semicircular canal has a lower specific gravity than its surrounding endolymph. It is characterized by a persistent geotropic direction-changing positional nystagmus in the supine head-roll test, and the identification of a null plane with slight head-turning to either side. Case presentation This study describes a case of recurring light cupula that occurred alternately on both sides. At the first episode, a null plane was identified on the right side, which led to the diagnosis of a light cupula on the right side. At the second episode, a null plane was identified on the left side, leading to the diagnosis of a light cupula on the left side. Conclusion This is the first case report of recurring light cupula alternately involving both sides. Although the pathophysiology is not entirely understood yet, the light cupula should be considered as one of causes of recurrent positional vertigo.