The surgeon creates a small hole in the skull and places a flexible catheter into the fluid compartment of the brain.  A second catheter is inserted under the skin from the scalp to the abdomen.  The end of this catheter is inserted into the abdominal cavity.  Both catheters are connected to a valve placed beneath the scalp.  The valve regulates the amount of cerebrospinal fluid in the brain, allowing the excessive fluid to drain out of the brain and into the abdominal cavity.  The incisions are closed with sutures.

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