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.
A spontaneous cerebrospinal fluid leak (SCSFL) is a medical condition in which the cerebrospinal fluid (CSF) held in and around the human brain and spinal cord leaks out of the surrounding protective dural sac, for no apparent reason.