医院消化科?郑日男Р定义(Definition)Р下消化道出血指屈氏(Treitz)韧带以下的消化道,包括小肠,大肠引起的出血?小肠出血比大肠出血少见,但诊断较为困难?近年来由于检查手段増多及治疗技术的提高,下消化道出血的病因诊断率有了明显提高,急性大出血病死率亦有所下降Р病因Р肠道原发疾病Р肿瘤?恶性肿瘤有癌、类癌、恶性淋巴瘤、平滑肌肉瘤、纤维肉瘤、神经纤维肉瘤等?良性肿瘤有平滑肌瘤、脂肪瘤、血管瘤、神经纤维瘤、囊性淋巴管瘤、粘液瘤等?息肉?腺瘤性息肉?幼年性息肉及幼年性息肉病?Peutz-Jeghers综合征РPartially ulcerated colorectal cancer plete circumferential infiltration.РA small whitish hyperplastic polyp with well-depicted and regularly distributed crypt openings is seen beside of a villous adenoma.Р炎症性病变Р引起出血的感染性肠炎有肠结核、肠伤寒、菌痢及其他细菌性肠炎等?寄生虫感染有阿米巴、血吸虫、兰氏贾弟鞭毛虫所致的肠炎,由大量钩虫或鞭虫感染?非特异性肠炎有溃疡性结肠炎、克罗恩病、结肠非特异性孤立溃疡等?抗生素相关性肠炎、坏死性小肠炎、缺血性肠炎、放射性肠炎等РTwo cases of Crohn's disease with large nodules and narrowing of the lumen.РIschemic Colitis ,Longitudinal involvement of the descending colon with a swollen mucosa panied by hemorrhage and exudates.
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