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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.
Prostatic utricle cyst. Dr Jeremy Jones â and Radswiki et al. Prostatic utricle cyst (PUC) is an area of focal dilatation that occurs within the prostatic utricle. They are midline cystic masses in the male pelvis and can be very difficult or impossible to distinguish from a Mullerian duct cyst.