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Keywords:
Bones, Extremities, Interventional non-vascular, MR, CT, Ablation procedures, Motility
Authors:
F. Arrigoni, S. Mariani, A. La Marra, L. M. Gregori, L. Zugaro, A. Barile, C. Masciocchi; L'Aquila/IT
DOI:
10.1594/ecr2015/B-0338
Methods and materials
From March 2011 we treated 34 Osteoid Osteoma (OO),
17 with MRgFUS and 17 with RFA.
To be treat with MRgFUS the lesion had to have a good acoustic window: for appropriate acoustic window we intend a conical pathway between the transducer,
which generates the ultrasounds,
and the target lesion.
This pathway must exclude metallic devices,
scars or other structures that reflect or refract the ultrasound beam,
which can prevent an effective ablation effect.
In this regard,
all lesions located deeper than 1.2 cm from the cortex or alternatively with an inappropriate acoustic window were considered unsuitable for the treatment with MRgFUS.
Fourteen OO were treated with MRgFUS in the lower arm and 3 in the upper arm (humerus).
The treatments lasted a mean time of 110 min.
The lesions treated with RFA were 14 in the lower arm,
1 in the upper arm and 2 in the vertebral body (L3 and L5) and were treated in a mean time lower than 100 min.
The follow-up was performed by MRI and CT,
instead the clinical evaluation was performed by VAS scale.
The follow-up was made up to 2 years.