visual suppression test で抑制消失を認めた ocular flutter 例

A 34-year-old woman presented with a history of dizziness, jerking of the eyes, and gait disturbance upon waking up. Two days later, she visited an otolaryngology doctor in her neighborhood, and on the same day she was referred to the otolaryngology department of Toyama Red Cross Hospital. She had had a headache and fever of 38 degrees a week prior to the onset of symptoms, which had soon resolved. Gaze nystagmus examination revealed a high frequency of pendular abnormal eye movements in the left-right direction. She showed bursts of horizontal saccadic oscillations with an amplitude of 7°–14°. A single burst of oscillations lasted up to 6 seconds. Caloric test showed loss of visual suppression in both ears. MRI revealed no significant abnormalities. She was able to walk on her own. For the purpose of excluding central dizziness, she was referred to the Department of Otorhinolaryngology, University of Toyama, and was diagnosed as having ocular flutter (OF). Electronystagmography (ENG), 30 days after the onset revealed loss of visual suppression in both ears. She was followed up without treatment, and after about 60 days, the OF disappeared, and 4 months later, it had completely resolved. It was speculated that there was a disorder in the cerebellar vermal lobules VI and VII and temporary flocculus and nodulus disorders.