What is a radical neck dissection? when is it done?

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What is a radical neck dissection? The surgeon removes a block of tissue from the collarbone to the jaw and from the front to the back of the neck. The large muscle on the side of the neck that is used for rotating, flexing or extending the neck is also taken out, along with the major vein on the side of the neck. Sometimes, a less drastic operation, called a supraomohyoid neck dissection is done. This takes out only the lymph nodes, the tissue surrounding the nodes and a muscle at the front of the neck. Another technique, called a functional neck dissection, saves the muscles of the neck, taking out only the lymph nodes and tissues surrounding them.
What kind of incision is made with a radical neck dissection? The incision depends upon what the surgery is for. It can run from below the ear to the collarbone. Everything in the front of the neck on one side or on both sides may be removed. This may include the lymph nodes, blood vessels, nerves, and the salivary gland under the jawbone.

Why does cholesterol form plaque in blood vessels?

What does it mean that I have plaque in an artery in my heart? 

Plaques are deposits of cholesterol and fibrous tissue built up over many years, beginning in childhood, in response to factors like smoking, high blood cholesterol, and high blood pressure, among others. These deposits are like lumps on the inside of the artery and are called atherosclerotic plaques. When the plaques build up and narrow the heart artery (known as a coronary artery) to about 50 percent of its original size, then the diagnosis of coronary artery disease may be made, although sensitive tests that are not often performed can detect smaller deposits.

After about 50 percent narrowing has occurred, coronary artery disease, also known as coronary heart disease, or CHD, can gradually or suddenly interfere with the pumping and circulation of blood, depriving tissue and organs (including the heart itself) of essential blood and oxygen.

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