Superior cluneal nerve pulsed radiofrequency treatment

Pulsed RF of left superior cluneal nerves Do you guys think the contrast outlines branches of the nerves, or just muscle fibers of the glutes? I am not sure either way. Patient did have strongly concordant stimulation at the lateral most 3 branches with 50hz stimulation. This guy weighs around 400lbs so U/s was not a good option.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pain Medicine Source Type: forums