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Spasmus nutans
Definition:
Spasmus nutans is a disorder affecting infants. It involves rapid, uncontrolled eye movements, head bobbing, and occasionally, abnormal positioning of the neck. Causes, incidence, and risk factors:
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Spasmus nutans involves a triad of symptoms which includes horizontal, vertical, or pendular nystagmus (fine, rapid jerking of the eyes back and forth, and from side to side), head nodding, and head tilting. Most cases begin between age 4 months and 1 year. It usually goes away by itself in several months to years. Less commonly it may be associated with other causative conditions. Rarely, symptoms like those of spasmus nutans may be produced by tumors in the optic chiasm or third ventricle of the brain.
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