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Fig. 2B. —MR images of 73-year-old man with giant cell arteritis. Contrast-enhanced, fat-saturated T1-weighted 2D spin-echo sequence at same position as A shows bright contrast enhancement of thickened vessel wall, strongly indicating arteritis (arrow). Concomitant bright signal intensity of lumen of temporal vein (arrowheads) and low signal intensity of lumen of temporal artery are due to flow-void phenomenon (arrow)