Fig. 2From: Identifying risk factors for metastasis to the level VII lymph node in papillary thyroid carcinoma patientsThe surgical field after level VII lymph node dissection via transcervical video-assisted approach and the working space were maintained by special self-developed retractors. BA, brachiocephalic artery; BV, brachiocephalic vein; CC, common carotid artery; S, subclavian artery; T, tracheaBack to article page