A 28-year-old man had experienced binocular diplopia for the last 2 months. Around the same time, he noticed mostly nocturnal polyuria and polydipsia and eventually was diagnosed with diabetes insipidus. Extraocular motility testing demonstrated jerky convergence movements on an attempted upgaze and mild lid retraction (video 1). Urgent MRI of the brain revealed a large mass in the dorsal midbrain region, which was also compressing the hypothalamus (figure). The lesion was biopsied and a diagnosis of primary intracranial germinoma arising from pineal tissue was made. Treatment with low-dose radiotherapy commenced. Characteristic clinical features of convergence retraction nystagmus in this case allowed rapid localization of the lesion, its diagnosis, and eventually treatment.1
Video 1
Extraocular motilityA classic example of convergence retraction nystagmus that represents co-contraction of bilateral medial recti in an attempt to look up producing characteristic jerky convergence movements on attempted upgaze.Download Supplementary Video 1 via http://dx.doi.org/10.1212/009481_Video_1
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- © 2020 American Academy of Neurology
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