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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.
Epidermoid cysts are congenital, true-cysts with epithelial-lined walls. They are usually well-defined, spherical, unilocular, and non-enhancing. Pancreatic pseudocysts occur in the splenic hilum as fluid tracks along the pancreatic tail in the setting of pancreatitis.ydatid cysts should be suspected in a patient with cysts in the liver, lung, and spleen. These cysts are typically large, and will have septations, daughter cysts, and hydatid sand. They may also have ringlike calcifications in chronic stages.