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FIGURE 1. (Top) Study showing accumulation of activity that 3 observers identified on conventional scintigraphy as a bleed. One observer thought the bleed to originate in small bowel; another observer, in ascending colon; and a third observer, in cecum. (Bottom) Alternate sequential subtraction scintigraphy demonstrates that activity remains constant over time (indicated by absence of activity), neither increasing in intensity (no additional bleeding) nor moving within bowel. Activity most likely represents a vessel consistent with prominent superficial vasculature.
