Kidney Stones, also known as renal calculi, are hard masses that separate urine from the urinary tract. These stones can occur anywhere in the urinary tract, including the kidneys, bladder, ureters and urethra.
This fluid is called the cerebrospinal fluid (CSF). When it leaks out, the pressure around the brain and spinal cord drops. Causes of leakage through the dura include: 1  Certain head, brain, or spinal surgeries.  Head injury.
In general, the spinal fluid leak is detected at the time of surgery and can be repaired. This is successful in solving the problem over 90% of the time. However, as some of the members have pointed out, a chronic leak can develop that requires more surgery.