Usually presents as fresh bleeding per rectum and this may be considerable. It is due to an arteriovenous malformation and commoner in the elderly. Localisation and embolisation by angiography may be curative during active bleeding, Surgery may be required if bleeding fails to settle on conservative management and, occasionally, 'blind' laparoscopic embolisation of a mesenteric vessel. However, localisation of the lesion may be difficult at laparotomy, necessitating extensive bowel resection.


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