[Supra- and subtentorial "hourglass" dermoid. Clinical case and review of the literature].

Authors report a case of 58 year-old woman suffering from a "clepsydra" shaped dermoid tumor spreading from the middle cranial fossa to the left posterior cranial fossa. The diagnostic importance of computed cysternotomography and the minor diagnostic value of other techniques such as angiography and pneumoencephalography is emphasized. The clinical picture and the surgical procedure are discussed in relation to a review of data available in the literature.