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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.
Radicular cysts or periapical cysts are the most common cystic lesions in the jaws. They arise from the epithelial remnants in the. periodontal ligament as a result of the stimulus from periapical infection following pulpal necrosis. They found mostly near apex. of the teeth.