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Case Reports in Otolaryngology
Volume 2016, Article ID 1249325, 3 pages
Case Report

Persistent Down-Beating Torsional Positional Nystagmus: Posterior Semicircular Canal Light Cupula?

1Department of Otorhinolaryngology, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku-ku, Tokyo 160-0023, Japan
2Ichimura ENT Clinic, 2-11-10 Nishiwaseda, Shinjuku-ku, Tokyo 169-0051, Japan

Received 9 July 2016; Revised 14 August 2016; Accepted 17 August 2016

Academic Editor: Nicolas Perez-Fernandez

Copyright © 2016 Akihide Ichimura and Koji Otsuka. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Supplementary Material

Video1. Positional nystagmus in the supine position: The supine head roll test revealed DBN with the torsional component toward the left without latency in straight supine position. The duration of the positional nystagmus was observed for > 90 s.

Video2. Positioning nystagmus: The Dix–Hallpike test of the right head-hanging position provoked DBN with the torsional component toward the left for > 30 s. Both left head-hanging and sitting positions on the Dix–Hallpike test did not provoke nystagmus.

  1. Supplementary Material