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Sampling process for the mCSG. (A) shows the transverse sonogram of mCSG, white star is the mCSG. (B) shows the long-axis ultrasound image of mCSG, white arrow head is the connected sympathetic nerve chain. (C) shows the biopsy of mCSG, white arrow is the puncture needle. (D) is the according picture of the process of biopsy. CCA, Common carotid artery; SCM, Sternocleidomastoid muscle.
