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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.
perineum. 1. The part of the body between the anus and the genitals. 2. The pelvic floor, especially referring to the area of muscle and tissue between the vaginal opening and the anus that is susceptible to tearing in childbirth.