Is skull fracture necessary for developing an intradiploic pseudomeningocele as a complication of head injury in adulthood?

We report the case of an adult with a posttraumatic intradiploic pseudomeningocele which caused an expanded osteolytic skull lesion. Local pain and swelling, the only symptoms of the lesion, regressed after surgery. Intradiploic pseudomeningocele must be distinguished from intradiploic leptomeningeal cyst, which is of traumatic origin or arachnoid cyst and epidermoid cyst, which are of congenital origin. We also discuss the development of intradiploic pseudomeningoceleafter head trauma without skull fracture in adulthood and suggest a possible mechanism. Copyright 2004 Springer-Verlag