This article presents the use of magnetic resonance tomographic angiog
raphy (MRTA) of the arterial circle (of Willis) in the diagnosis of so
me clinically relevant abnormalities, with special reference to trigem
inal neuralgia and aneurysms. Clin. Anat. 11:338-331, 1998. (C) 1998 W
iley-Liss, Inc.