Seesaw nystagmus
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Seesaw nystagmus is a type of pendular nystagmus that has been reported in patients with giant suprasellar lesions that compress the mesodiencephalic region.A 52-year-old man presented to the emergency department with a 1-year history of generalized headache, diminished vision, and abnormal eye movements. Examination of the fundus revealed disk pallor. His pupillary reflexes were normal, but there was reduced visual acuity (20/120) in both eyes and bitemporal hemianopia. Ocular examination revealed rhythmic, torsional, and vertical movement in which the eye rotating inward moved up as the other eye moved down, a finding known as seesaw nystagmus.The movement increased in amplitude during downward gaze. Magnetic resonance imaging of the brain revealed a giant pituitary adenoma measuring 48 mm in diameter (arrow), with suprasellar extension that was compressing the optic chiasm...

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