PMC5290631_01
Axial spoiled gradient echo fat-saturated postcontrast image immediately following the first MRgFUS treatment in a 7-year-old boy with large desmoid tumor within the musculature of the thigh. Near total non-perfused volume (white circle) is seen at this level within the central portion of the mass, with minimal rim enhancement
40349_2017_81_Fig1_HTML.jpg
PMC5290631_01_40349_2017_81_Fig1_HTML.jpg
Fig1
Postcontrast imaging immediately following the treatment demonstrated 75% non-enhancing volume (Fig. 1). 
PMC5290631_02
Axial spoiled gradient echo fat-saturated postcontrast image immediately following a second MRgFUS treatment in a 21-year-old woman with desmoid tumor in the posterior compartment of the thigh. Near total non-perfused volume is seen at this level despite close proximity to the sciatic nerve (white arrow), with minimal rim enhancement
40349_2017_81_Fig2_HTML.jpg
PMC5290631_02_40349_2017_81_Fig2_HTML.jpg
Fig2
There was approximately 70% non-enhancing volume within the targeted superior 1/2 of the mass (where there had been the most interval growth following the prior treatment) (Fig. 2).
PMC5290631_03
Sagittal spoiled gradient echo fat-saturated postcontrast images a before and b immediately following MRgFUS treatment in a 14-year-old girl. The pretreatment image clearly demonstrates the sciatic nerve coursing through the posterior aspect of the mass (black arrows). Post-treatment plane demonstrates large non-perfused volume with relative sparing of the region immediately adjacent to the nerve (white arrows)
40349_2017_81_Fig3_HTML.jpg
PMC5290631_03_40349_2017_81_Fig3_HTML.jpg
Fig3
These increased energies resulted in an increased non-perfused volume of approximately 70% (Fig. 3).