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Figure 3 | BMC Ophthalmology

Figure 3

From: Lying-down nystagmus and head-bending nystagmus in horizontal semicircular canal benign paroxysmal positional vertigo: are they useful for lateralization?

Figure 3

Apogeotropic canaloithiasis in the short arm of the right horizontal semicircular canal. It can cause ampullopetal endolymphatic migration, which induces ipsilesional (opposite directional) lying-down nystagmus (A, B). It can also lead to the contralesional (opposite directional) head-bending nystagmus (A, C). (Adapted from reference [23]: G. Asprella-Libonati. Pseudo-Spontaneous Nystagmus: a new sign to diagnose the affected side in Lateral Semicircular Canal Benign Paroxysmal Positional Vertigo. Acta otorhinolaryngologica Italica : organo ufficiale della Societa italiana di otorinolaringologia e chirurgia cervico-facciale, Figure one, three 2008, 28(2):73–78., with permission, Copyright © by Società Italiana di Otorinolaringologia e Chirurgia Cervico-Facciale Via Luigi Pigorini, 6/3 00162 Roma, Italy).

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BMC Ophthalmology

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