It sounds like science fiction but it’s not. As described in the Your Health section of the June 2009 Erickson Tribune, high intensity focused ultrasound (HIFU) can destroy tumors and cancer—it’s called ablation—without making any incisions. 

Only one device has been approved for use in the U.S. (to treat uterine fibroids), but other places are using it for further treatments. Check them out here: 

Maple Leaf HIFU Co. http://www.hifu.ca/
International HIFU http://www.internationalhifu.com/
InSightec http://www.insightec.com/108-en/Fibroid-TreatmentLocations.aspx
Ultrashape http://www.ultrashape.com/company_profile.aspx

While focused ultrasound is fascinating, and seems feasible, there’s one thing about it that I wish was fiction. If it lands somewhere other than where intended, it could destroy (ablate!) that area unintentionally. Then again, hitting the right area could save your life.