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Geotropization of a direction-fixed paroxysmal nystagmus left lateral canal BPPV by side-to-side head rotations in supine position (left view). (a) decubitus on the affected side; (b) intermediate position during rotation; (c) decubitus on the healthy side; (d) Complete geotropization is achieved when all otoliths pass in the non-ampullary arm; the endolymphatic flow on the affected side becomes ampullopetal (inner arrows).
