After superselective mesenteric angiography was performed, the coaxial catheter was left in the artery supplying the abnormal segment of small bowel. Methylene blue (1 mL) was injected selectively through the bleeding artery to stain the bowel at the point of hemorrhage. The injection of methylene blue dye immediately demarcated the territory of small bowel supplied by this mesenteric artery by a brilliant blue color and therefore guided the extent of the resection. The source of the bleeding can be seen at the end of the video as a concentrated dark blue area.
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