Tarlov cysts: Tarlov cysts are benign outpouchings of the meninges which may or may not contain nerve roots. These are usually asymptomatic (incidental finding on MRI scans of the lumbar spine) and occur in the presacral space which is behind the rectum and in front of the sacrum and tail bone (coccyx). The Tarlov cysts are not the cause of the low back pain.
Answered 5/23/2017
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