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A: Position of ultrasound probe in the right supraclavicular fossa, 2 cm superior to the junction of the medial one-third and lateral two-thirds of the clavicle, allowing imaging of the space between the trapezius and sternocleidomastoid muscle. B: Representative ultrasound image of the supraclavicular fossa. AT: adipose tissue; SCM: sternocleidomastoid.
