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A-B. (A) Sonogram of the suprascapular area. (B) Sonogram of the interscalene area. The needle approach is from the lateral aspect through the middle scalene muscle. ASM, anterior scalene muscle; ASSN, anterior suprascapular nerve; BP, brachial plexus; IJV, internal jugular vein; MSM, middle scalene muscle; OM, omohyoid muscle; SA, subclavian artery; SCM, sternocleidomastoid muscle.
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