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FIG 1. 78-year-woman with bilateral cavernous carotid aneurysms. A–D, T2-weighted fast spin-echo (FSE) image (A) (4200/99/2 [TR/TEeff/excitations]) shows bilateral enlargement of cavernous sinus by giant aneurysms of internal carotid arteries. These are of mixed signal intensity with high signal in areas of turbulent flow. 3D-TOF (B) (40/6.9/1; flip angle, 20°) shows only the entering vessels, but not aneurysm sacs nor exiting vessels, which are seen on contrast-enhanced 3D-TOF (C) (40/6.9/1/45°) and dynamic contrast-enhanced MRA sequences (D) (6.4/1.4/1/30°, slice thickness = 1.5 mm). These also show extension of aneurysmal dilatation into both middle cerebral arteries (MCAs). On the contrast-enhanced 3D-TOF sequence (C), the signal intensity of aneurysm sacs and distal vessels is attenuated compared with that of contrast-enhanced dynamic MRA (D), which provides excellent contrast between vessels and background
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