Angiodysplasia:
It is theorized that veins in the colon become damaged over time. This causes capillaries to dilate (capillaries are blood vessels that connect the artery side of the circulatory system to the venous side). These dilated capillaries no longer function properly, causing the body to compensate by forming direct connections between the arterial and venous sides-called angiodysplastic lesions. These abnormal blood vessel connections have a tendency to bleed, especially in the elderly.
Fafnir
