Torsional nystagmus: quantitative features and possible pathogenesis.
- We measured eye rotations in three planes in a patient with acquired, torsional nystagmus. This nystagmus had linear or increasing-velocity waveforms, was increased after active pitch rotations of the head, and was suppressed by convergence. Magnetic resonance imaging demonstrated a midpontine lesion that was probably a venous angioma. We postulate that torsional nystagmus in this patient was due to disruption of central vestibular connections.
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