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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.
The most common inflammatory cyst is the periapical cyst arising from a nonvital tooth, whereas the dentigerous cyst is by far the most commonly occurring developmental odontogenic cyst. The dentigerous cyst is always associated with an impacted or unerupted tooth; most commonly a third molar or wisdom tooth.