The traditional surgery is to take a bit of the cranium off, a bit of the skull, drain this fluid out, stick a drain in place, and then eventually bring this drain internal to the body.
La chirurgie classique  consiste à prendre un bout de crâne, de la boîte crânienne, drainer l'excès de LCR,  poser un drain chirurgical, et enfin,  ramener ce drain à l'intérieur du corps.