The procedure has been used before to remove uterine fibroids (or small, benign tumors in the uterus), and looks like a promising candidate to eliminate tumors from breasts and, hopefully, the brain. The biggest challenge when tackling the brain is getting the ultrasonic beams through the skull with any intensity, but that's handled by a head harness developed by InSightec, which is equipped with 1,000 ultrasound transducers and even built-in cooling to keep the skull from overheating.
Source: http://dvice.com/archives/2009/07/sound-wave-neur.php
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