Benedict Carey writes about surgical treatments for obsessive compulsive disorder in yesterday's New York Times in "Surgery for Mental Ills Offers both Hope and Risks,"
In one procedure, called a cingulotomy, doctors drill into the skull and thread wires into an area called the anterior cingulate. There they pinpoint and destroy pinches of tissue that lie along a circuit in each hemisphere that connects deeper, emotional centers of the brain to areas of the frontal cortex, where conscious planning is centered.
This circuit appears to be hyperactive in people with severe O.C.D., and imaging studies suggest that the surgery quiets that activity. In another operation, called a capsulotomy, surgeons go deeper, into an area called the internal capsule, and burn out spots in a circuit also thought to be overactive.
An altogether different approach is called deep brain stimulation, or D.B.S., in which surgeons sink wires into the brain but leave them in place. A pacemaker-like device sends a current to the electrodes, apparently interfering with circuits thought to be hyperactive in people with obsessive-compulsive disorder (and also those with severe depression). The current can be turned up, down or off, so deep brain stimulation is adjustable and, to some extent, reversible.In yet another technique, doctors place the patient in an M.R.I.-like machine that sends beams of radiation into the skull. The beams pass through the brain without causing damage, except at the point where they converge. There they burn out spots of tissue from O.C.D.-related circuits, with similar effects as the other operations.
Carey goes on to talk about the rigorous screening, the risks of surgery, and tells stories of both good and bad outcomes.