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A 71-year-old male patient (case 3) with a tumor involving the gastroesophageal junction. (a) Delineations of the esophageal GTV of the 10 observers on T2-weighted MRI only. (b) The added diffusion-weighted MRI scan of the same slice, showing the differentiation between tumor and gastric wall thickening. (c) Delineations adjusted after the addition of diffusion-weighted MRI. Abbreviations: GTV = gross tumor volume; MRI = magnetic resonance imaging.
