Teaching Video NeuroImage: Spasmus Nutans, an Infantile Nystagmus

A 5-month-old boy came to the emergency department because of a monocular nystagmus with head-nodding and torticollis (Video 1). Fundoscopic examination excluded macular/optic nerve hypoplasia and retinal abnormalities. Brain MRI was unremarkable (Figure). A diagnosis of spasmus nutans (SN) was made.