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Fig. 5. —9-year-old boy with polyarteritis nodosa and thenar erythema who was suspected of having arterial occlusion. Volume-rendered MDCT angiogram in anterior projection shows bilateral patency of radial artery (short arrows), superficial palmar branch of radial artery (arrowheads), and ulnar (long arrows) and digital arteries with no evidence of occlusion. Superficial and deep palmar arches are also seen. Note venous contamination that does not obscure arterial structures.