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Gross and microscopic findings of tissue sampling sites in case 2. A, The gross findings of the nonmalignant epithelium away from the cancer site (N), two invasively spreading lesions (IS1 and IS2), the solid lesion (S), and disseminated tumor in the small intestinal mesentery (D) in case 2 are shown. The spread of IS1 and IS2 is traced in black. B, Microscopic findings of each sample are shown (200× magnification; scale bar, 100 μm)
