Abstract
Two patients are presented with a head-bobbling tic classically associated with a suprasellar cyst. The first of these showed hypothalamic, neuroendocrinological and limbic abnormalities not previously described, although with a classic arachnoidal suprasellar cyst. The 2nd patient showed head-bobbling behavior during the first years of life as a manifestation of one of many episodes of ventricular shunt obstruction. This case is the first reported whose head bobbling was observed with an acute lesion.