"As the name suggests, a catheter is placed with its tip in the lumbar spinal canal (intrathecal). The distal catheter is tunnelled under the skin and into the peritoneal cavity. The catheter may or may not have a valve that regulates the flow of CSF based on a preset pressure."
"It is used for CSF shunting if there is no intracranial mechanical or local cause of obstruction, e.g. communicating hydrocephalus, idiopathic intracranial hypertension, postoperative pseudomeningoceles, and cerebrospinal fluid fistulas 1,2."
"infection (e.g. meningitis)"