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Figure 8b.   Polyarteritis nodosa with bowel ischemia in a 58-year-old man. (a) Contrast-enhanced CT scan shows bowel wall thickening in the jejunum (arrows) with minimal engorgement of the vasa recta and the arcade of the jejunal vascular branches. (b) Coronal half-Fourier single-shot fast spin-echo MR image shows bowel wall thickening in the jejunum (arrows) with mesenteric haziness (arrowheads). (c) Digital subtraction angiogram shows multiple berry aneurysms in the proximal SMA (arrows) and multifocal areas of luminal narrowing.