Fig 3. Coronal oblique MIP and volume-rendered projections from contrast-enhanced MRA (upper row) and TOF-MRA (lower row) show a large (16 x 12 mm) aneurysm arising from the cavernous portion of the right internal carotid artery. Note loss of signal intensity and incomplete flow-related enhancement of the aneurysm sac at TOF-MRA, which limits definition of the border of the aneurysm.