Hi, an EVD is an external shunt. The internal infected shunt being removed and replaced by one that goes into the head as any shunt but then is threaded out of the skin and connected upto a bag to collect it.

Are these doctors youve been seeing, GPs or your neurosurgeons, you should be dealing with your neurosurgeon or consultant with any wound infection form your shunt. Right away if you havent seen him/her.

Best of luck x