[Epidermal cysts of the cerebellopontile angle]

The authors describe six cases of epidermoid cysts of the cerebellopontine angle. They insist on the progressive development, the variable duration and the polymorphism of the symptomatology. The imaging techniques relevant to diagnosis are reviewed. Among these computerized cisternotomography and N.M.R. are the methods of choice. It is suggested that surgical removal should be total whenever possible because of the risk of recurrence of these cysts but with great caution not to cause a vital or functional damage of the brain stem.