Intradiploic leptomeningeal cyst of the posterior fossa --a case report--.

It is well known that head injuries with a linear skull fracture in infancy sometimes cause a growing skull fracture') with or with out a leptomeningeal cyst.') This condition, however, is mainly located in the supratentorial portion of the cranium. Leptomeningeal cysts in the posterior fossa are rare, and to our knowledge, there have been only four cases reported in the literature. The leptomeningeal cyst of the posterior fossa develops as an intradiploic cyst and never destroys the outer table of the skull. In this paper, a case of an intradiploic leptomeningeal cyst of the posterior fossa is presented.