CPU architecture is the layout of the cpu, it is its design -- where the cores, caches, etc are placed inside the cpu. Yes, it is important when buying a PC.
Ad. In some patients who suffer from frequent sinus infections or inflamed tonsils, fluid can become trapped and form into a 'pocket.' This sac then becomes a tonsil cyst. Under most circumstances, the doctor might decide to remove the cyst, unless it shows signs of draining on its own.
A subchondral bone cyst is a fluid-filled sac that forms inside of and extends from the bone of a joint. It is seen on X-rays in cases of osteoarthritis. These cysts are not treated. They are a sign of osteoarthritis, although they do not occur in all cases.