Shin Jung Eun, Kim Chang-Hee
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.
BMC Ear Nose Throat Disord. 2015 Mar 14;15:2. doi: 10.1186/s12901-015-0015-z. eCollection 2015.
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.
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.
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.
轻嵴帽是一种半规管嵴帽比重低于其周围内淋巴液的情况。其特征为在仰卧位摇头试验中出现持续的向地性方向改变的位置性眼球震颤，以及向两侧轻微转头时可识别出一个零平面。
本研究描述了一例双侧交替出现的复发性轻嵴帽病例。在首次发作时，右侧识别出一个零平面，从而诊断为右侧轻嵴帽。在第二次发作时，左侧识别出一个零平面，诊断为左侧轻嵴帽。
这是首例双侧交替出现复发性轻嵴帽的病例报告。尽管其病理生理学尚未完全明了，但轻嵴帽应被视为复发性位置性眩晕的病因之一。
