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Fig. 1C. —60-year-old woman with biopsy-proven adenocarcinoma in head of pancreas. Three-dimensional volume-rendered vascular image shows course and caliber of superior mesenteric artery (arrows) is normal.

All three observers interpreted grade 3 involvement of superior mesenteric artery on axial and combined images. Two observers interpreted grade 1 involvement of superior mesenteric artery on reformatted images.