The 2D Time-Of-Flight MRA/MRV displays in high
resolution the arteries and veins which supply the brachial
plexus. The amount of blood flow is proportional to signal
intensity (which correlates to proton density). Gray, hazy
areas indicate diminished flow (compression).
In this view, images of the patient with arms in neutral
(i.e., at side) and abduction external rotation (AER, i.e.,
overhead) are displayed for comparison. The vascular
compression, which is evident in the neutral position, is
more pronounced in the AER position.
A different perspective is obtained by viewing the
negative image, where the black/white color map
is reversed (i.e. black becomes white and white
becomes black). Observe the close proximity of the shoulders to the neck in the AER position, enchancing costoclavicular compression.
