Ruptured Tentorium Originating Masson Tumor.

Intravascular papillary endothelial hyperplasia (IPEH) also known as Masson's tumor, is a benign, slow growing, vascular lesion which is seen very rarely and only a few cases have been reported intracranially in the literature. It has been reported at many sites, but the posterior fossa involvement is very rare. The preoperative diagnosis is very difficult, as there is no enough cases to achieve a clear understanding about the details of its radiological findings. Differential diagnosis have to be made especially from angiosarcoma and meningioma. It is curable by total surgical removal. In this article we presented the characteristic clinical, radiological, perioperative and pathological findings in a case of IPEH in an unusual location, origin and behavior. To best of our knowledge, we presented the first case of IPEH originating from tentorium.