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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.
Epididymal Cyst. An epididymal cyst is a smooth, fluid-filled lump found on the testicles. Although some men may worry that they are a sign of cancer or another serious problem, epididymal cysts are in fact benign and thus not a health risk.pididymal cysts can be very small, but some can grow to the same size as a testicle or even as large as a grapefruit! There are normally no symptoms unless a cyst becomes infected, in which case it may drain fluid and become painful or swollen.