The online version of this article (doi:10.1186/s12901-015-0015-z) contains supplementary material, which is available to authorized users.
The authors declare that they have no competing interests.
CHK interpreted the case, and drafted and submitted the final manuscript. JES made substantial contribution in interpreting the case, and drafted the part of the discussion. Both authors have revised the manuscript critically and approved the final manuscript.
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.
Additional file 1: Nystagmus in the supine position at the first vertigo attack. Left-beating nystagmus is observed.12901_2015_15_MOESM1_ESM.zip
Additional file 2: Head-roll to the right at the first vertigo attack. Right-beating nystagmus is observed.12901_2015_15_MOESM2_ESM.zip
Additional file 3: Head-roll to the left at the first vertigo attack. Left-beating nystagmus is observed.12901_2015_15_MOESM3_ESM.zip
Additional file 4: Nystagmus in the supine position at the second vertigo attack. Right-beating nystagmus is observed.12901_2015_15_MOESM4_ESM.zip
Additional file 5: Head-roll to the right at the second vertigo attack. Right-beating nystagmus is observed.12901_2015_15_MOESM5_ESM.zip
Additional file 6: Head-roll to the left at the second vertigo attack. Left-beating nystagmus is observed.12901_2015_15_MOESM6_ESM.zip
- Light cupula of the horizontal semicircular canal occurring alternately on both sides: a case report
Jung Eun Shin
- BioMed Central
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