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.
Home/Education/Terminology/Dural Leak. The dura is the outside lining of the sack containing the nerves and spinal cord. Inside this sack are obviously the nerve roots and fluid called CSF or cerebral spinal fluid. A dural leak is a small tear of the dura and a subsequent leak of this spinal fluid. Repairing the leak is normally a simple matter of some small sutures and a patch of specialized material.