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Hemorrhoids (or haemorrhoids), also known as piles, are vascular structures in the anal canal. [ 7 ] [ 8 ] In their normal state, they are cushions that help with stool control. [ 2 ] They become a disease when swollen or inflamed ; the unqualified term hemorrhoid is often used to refer to the disease. [ 8 ]
Internal hemorrhoids are inside your anus and painless but can cause bleeding during bowel movements. External hemorrhoids occur when hemorrhoids are pushed just outside of the anal opening.
Rectal bleeding refers to bleeding in the rectum, thus a form of lower gastrointestinal bleeding. There are many causes of rectal hemorrhage, including inflamed hemorrhoids (which are dilated vessels in the perianal fat pads), rectal varices , proctitis (of various causes), stercoral ulcers , and infections .
Hemorrhoids are fed by arteries and drained by veins. The arterial blood supply is based on the superior rectal (hemorrhoidal) artery. Just as veins in the leg weaken and become prominent, hemorrhoidal veins also may become varicose, resulting in internal hemorrhoids or “piles”. Internal hemorrhoids are divided into four grades.
The symptoms of a perianal hematoma can present over a short period of time. Pain, varying from mild to severe, [ 3 ] will occur as the skin surrounding the rupture expands due to pressure. This pain will usually last even after the blood has clotted, and may continue for two to four days.
The procedure involves blocking the abnormal blood flow to the rectal (hemorrhoidal) arteries using microcoils and/or microparticles to decrease the size of the hemorrhoids and improve hemorrhoid related symptoms, especially bleeding. [2] It is a minimally invasive therapy that can be performed as an outpatient procedure. [3]
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