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 some cases, damage to the spine or the brain can result in leakage of the cerebrospinal fluid. When this occurs, the pressure around the central nervous system drops. New York Presbyterian Hospital noted that common sites of a cerebrospinal fluid leak are in the thoracic spine and cervicothoracic junction of the spinal cord.