Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Anteroposterior vertebral angiogram showing 50% isodose line used to deliver Gamma Knife radiosurgery. (b) Lateral carotid angiogram showing 50% isodose line used to deliver radiosurgery. (c) Sagittal CT reconstruction showing that the majority of tissue within the radiation field was venous sinus (arrow) or bone. The wall of the venous sinuses—the presumed location of the fistulae—was contained within the isodose line.
