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Fig. 1A. 60-year-old woman with biopsy-proven adenocarcinoma in head of pancreas. Axial source image from arterial phase of dual-phase helical CT reveals soft-tissue attenuation surrounding superior mesenteric artery (arrow).

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.