The following link describes a new procedure where HIFU is used to treat essential tremor. I will watch developments in this area with interest since it may herald a new way to treat other brain diseases.
A new chapter in medical history opened days ago when noninvasive MR-guided focused ultrasound was used to successfully treat a patient with essential tremor (ET), a progressive neurological disorder that affects millions of people worldwide and causes involuntary shaking of the hands, head, face, eyelids, voice or other muscles.http://www.fusfoundation.org/Newsletter/fusf-newsletter-volume-29