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The superior piercing variant, the most common brachial plexus variant, identified using ultrasonography in the present study: (A) unlabeled; and (B) labeled. Note that the superior trunk is not separated from the anterior scalene in this condition, visible as a lack of hyperechoic fascia. AS = anterior scalene; IT = inferior trunk; MS = middle scalene; MT = middle trunk; SCM = sternocleidomastoid; ST = superior trunk. The green outlines demarcate the trunks of the brachial plexus.
