血管发育异常(angiodysplasias)或血管扩张(vascular ectasias)可遍布胃肠道， 引起无痛性出血，表现为黑粪症、便血或隐.匿性失血，占下消化道出血的500^1000，最 常见于盲肠和升结肠。
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如同生日派对上的气球，健康的血管很柔韧，整天都会根据需要扩张或收缩。
Like birthday party balloons, healthy blood vessels are flexible, widening and narrowing as needed throughout the day.
由这些细胞释放出的组胺导致小血管扩张，引起众所周知的症状，比如搔痒、口腔肿胀、皮疹、鼻子发痒或流鼻涕，或腹泻。
Histamine released by these cells causes small blood vessels to dilate, giving rise to the well-known symptoms such as itching and swelling in the mouth, skin rash, itchy or runny nose or diarrhoea.
一些孩子，当血管瘤完全消失后，可能会留下松懈的皮肤，变色，或微小的、扩大的血管(毛细管扩张)。
In some children, loose skin, discoloration, or tiny, dilated blood vessels (telangiectasias) may remain after the hemangioma has fully involuted.
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