临床表现
便血
下消化道出血, 如出血量多则呈现红, 若 停留时间较长, 则为暗红色.
肛门或肛管疾病出血, 如痔, 肛裂或直肠 肿瘤引起的出血, 表现为血色鲜红不与粪便混 合, 仅粘附于粪便表面或于排便后有鲜血滴出 或喷射者.
临床表现
出血量不多则全身症状不明显
如短期内出血量多, 则可出现贫血及 周围循环衰竭症状.
死性胰腺炎, 小肠肿瘤, Crohn病, 小肠血 管瘤, 空肠憩室炎或溃疡, 肠套叠.
病因
3. 结肠疾病
急性细菌性痢疾, 阿米巴性痢疾, 血吸虫, 溃疡性结肠炎, 结肠憩室炎, 结肠癌, 结肠息肉病, 缺血性结肠炎.
4. 直肠肛管疾病
直肠肛管损伤, 非特异性直肠炎, 直肠息肉, 直肠癌, 痔, 肛裂, 肛瘘.
Meckel's Diverticulum
shows gastric mucosa
Meckel's Diverticulum
. Most Meckel's diverticula remain asymptomatic common complication, usually occurs in childhood. Patients present with painless bleeding described as "currant jelly."
Diverticular Bleeding
Diverticular bleeding presents with acute, painless, maroon栗色的 to bright red hematochezia, although melanic stools may occur. The degree of blood loss is often significant and may not be well tolerated by the elderly population at risk.