PMC8008736_01
Sagittal STIR MRI sequence with shoulder abducted showing superior trunk separating from the middle and inferior trunks, and kinking toward the costoclavicular space.
JRMCC-3-1000034-g001.jpg
PMC8008736_01_JRMCC-3-1000034-g001.jpg
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This MRI (Fig. 1) showed that the superior trunk separates from the inferior and middle trunks and takes a 90  turn and kinks as it travels toward the costoclavicular space, where it has mildly elevated T2 signal.