General: Caused by massive dilation of the third ventricle; occurs in childhood.
Ocular: Pallor of the optic disk or optic atrophy; visual loss.
Clinical: Flexion extension movements of the head and neck on the trunk at a rate of two or three per second; pendular movements also may involve the trunk and upper limbs; hydrocephalus; obesity; head bobbing ceases during sleep; mental retardation.

Benton JW, et al. The bobble-head doll syndrome: report of a unique truncal tumor associated with third ventricular cyst and hydrocephalus in children. Neurology 1966; 16:725-729.
Kirkham TH. Optic atrophy in the bobble-head doll syndrome. J Pediatr Ophthalmol 1977; 14:299-301.
Magalini SI, Scrascia E. Dictionary of Medical Syndromes, 2nd ed. Philadelphia: JB Lippincott, 1981.