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TitleDescriptionType
1 Periodic Alternating Nystagmus Due to a Chiari MalformationThis patient first experienced oscillopsia 12 months prior to this video. Three months after the onset of symptoms, she was seen by neuro-ophthalmology and found to have a spontaneous, unidirectional left-beating nystagmus (that did not reverse) in addition to saccadic smooth pursuit. Oscillopsia wo...Image/MovingImage
2 Periodic Alternating Nystagmus Due to Nodulus StrokeThis is a 70-year-old woman who experienced the acute onset of vertigo and imbalance. MRI demonstrated a diffusion-weighted imaging hyperintensity involving the nodulus (with corresponding ADC hypointensity) consistent with an acute stroke. On examination several weeks after the stroke, periodic alt...Image/MovingImage
3 Periodic Alternating Nystagmus Due to Nodulus Stroke (Figure 1)This is a 70-year-old woman who experienced the acute onset of vertigo and imbalance. MRI demonstrated a diffusion-weighted imaging hyperintensity involving the nodulus (with corresponding ADC hypointensity) consistent with an acute stroke. On examination several weeks after the stroke, periodic alt...Image
4 Periodic Alternating Nystagmus and Central Head-Shaking Nystagmus from Nodulus Injury𝗢𝗿𝗶𝗴𝗶𝗻𝗮𝗹 𝗗𝗲𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻: This is a 35-year-old man who suffered a gunshot wound to his cerebellum. When he regained consciousness days later, he experienced oscillopsia due to periodic alternating nystagmus (PAN). He was started on baclofen 10 mg...Image/MovingImage
5 Periodic Alternating Nystagmus Due to Spinocerebellar Ataxia Type 6𝗢𝗿𝗶𝗴𝗶𝗻𝗮𝗹 𝗗𝗲𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻: This 50-yo-man complained of imbalance for several years and more recently oscillopsia. On examination, there was saccadic pursuit and VOR suppression in addition to gaze-evoked nystagmus with rebound, raising suspicion f...Image/MovingImage
6 Periodic Alternating Nystagmus and Perverted Head-shaking Nystagmus in Cerebellar Degeneration𝗢𝗿𝗶𝗴𝗶𝗻𝗮𝗹 𝗗𝗲𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻: This is a 60-yo-woman with several years of worsening imbalance, diplopia (hers was actually unrelated to cerebellar pathology [although she did have an esotropia greater at distance that was cerebellar in origin] and due...Image/MovingImage
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