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.
Often a spinal cord injury (SCI) is caused by a blow to the spine , resulting in broken or dislocated bones of the spine (vertebrae). The vertebrae bruise or tear the spinal cord , damaging nerve cells. When the nerve cells are damaged, messages cannot travel back and forth between the brain and the rest of the body.