PMC3821125_01
Ultrasound images over the anterior neck at the level of the brachial plexus roots. A) Normal position of the brachial plexus roots when a 25G needle (arrowheads) was just introduced above the brachial plexus roots (arrow). B) The fascial sheath enclosing the brachial plexus roots (arrow) is indented producing a lengthening of the distance, compared to figure 1A, when the needle (arrowheads) was advanced further. This also resulted in paresthesia.
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fig672
Under ultrasound guidance, a 3.5 inch, 25 G needle was advanced to approximately 2-3 cms during attempts to visualize the needle tip (Figure 1).