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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.
In human anatomy, the perineum (/pÉrÉËniËÉm/ ; Late Latin, from Greek ÏÎµÏÎ¯Î½ÎµÎ¿Ï - perineos) is a region of the body including the perineal /pÉrÉËniËÉl/ body and surrounding structures.There is some variability in how the boundaries are defined.n human anatomy, the perineum (/pÉrÉËniËÉm/ ; Late Latin, from Greek ÏÎµÏÎ¯Î½ÎµÎ¿Ï - perineos) is a region of the body including the perineal /pÉrÉËniËÉl/ body and surrounding structures.