Synchronous occurrence of a ruptured skull base teratoma and an expansile porencephalic cyst presenting with proptosis

摘要

Porencephalic cysts (PCs) typically do not affect flow or pressure dynamics of the cerebrospinal fluid (CSF) and are often asymptomatic. Neurological deficits in these patients are due to associated developmental anomalies or preceding parenchymal insult(s). Although local mass effect and raised intracranial pressure have been described in some cases, herniation of a PC into the extracranial compartment is anecdotal. We describe a singular case of a spontaneous herniation of a PC into the orbit. The added peculiarity was its synchronous association with a ruptured skull base teratoma.