Scaffolding on which the brain rests.
Large vessels and nerves including the brainstem traverse their way to and from the brain.
Tumors that arise in this area can originate fro the brain, nerves, sinus or bone.
Tumors include meningiomas, neuromas, angiomas, schwannomas, melanoma, sarcomas, pituitary tumors, bone tumors, cysts, and fibrous lesions.