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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.
Dental lamina cyst, also known as gingival cyst of newborn, is a benign oral mucosal lesion of transient nature. These lesions are usually multiple but do not increase in size. Since the lesions are self-limiting and spontaneously shed a few weeks or months after birth no treatment is required.