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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.
Choledochal Cyst is a rare congenital (present at birth) defect where the bile ducts (tubes that carry bile from liver to intestines) are dilated and wider than usual. These cysts may be intra-hepatic (bile ducts inside the liver) or extra-hepatic (outside the liver).