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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.
Parapelvic cysts, also called peripelvic cysts, are uncommon conditions where these cysts are located on, or probably originate in, the hilus of the kidney in close proximity to the pelvis and major calyces.Most often, parapelvic cysts are due to congenital factors and occur above 50 years old.arapelvic cysts, also called peripelvic cysts, are uncommon conditions where these cysts are located on, or probably originate in, the hilus of the kidney in close proximity to the pelvis and major calyces. Most often, parapelvic cysts are due to congenital factors and occur above 50 years old.