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患者，女性，68岁，因反复便血4年入院。4年前开始无诱因反复出现相抽样便或暗红色血便，每3－4个月1次，出血量大时需输血治疗。曾3次急诊行胃镜检查、2次全消化道钡餐检查均未发现异常。l年前经历剖腹探查手术，未发现病变。入院后纤维结肠镜检查未见异常；杨系膜上动脉造影?
The patient, female, 68 years old, was hospitalized for 4 years because of repeated bloody stools. Four years ago, there was no incentive to repeat the phase of sampling or dark red bloody stools. Once every 3-4 months, blood transfusion was needed when there was a large amount of bleeding. There were no abnormalities in gastroscopic examinations and two full-digestive barium examinations in the three emergency clinics. L laparotomy was performed l years ago and no lesions were found. There was no abnormality in colonoscopy after admission; superior mesangial artery angiography?