Intervention; interposition; the act of a third person who interferes between two contending parties with a view to reconcile them or persuade them to adjust or settle their dispute.
Subchondral cyst formation is characteristic of osteoarthritis and can be routinely found on x-rays. A subchondral cyst is a fluid-filled sac that extrudes from the joint, consisting of thickened joint material (mostly hyaluronic acid, a substance found in the normal joint fluid that serves to lubricate the joint). Subchondral bone is the layer of bone just below the cartilage.
Overview. Perineural cysts, which are also known as Tarlov cysts, are fluid-filled sacs that form on nerves at the base of the spine. A person with such cysts would likely never know it. They almost never cause symptoms. When they do cause symptoms, however, the most common is pain in the lower back, buttocks, and legs. cyst is a sac that can form anywhere in the body and is filled with air or some type of fluid. Most of these are completely benign and noncancerous. Perineural cysts are those that form in the sacrum, or the base of the spine.