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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.
Dr Henry Knipe â and Radswiki et al. Peritoneal inclusion cyst (PIC) (also known as a peritoneal pseudocyst) is a type of cyst-like structure that appears in relation to the peritoneum and results from a non neoplastic reactive mesothelial proliferation.