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A union of the left subclavian vein and the left internal jugular vein is seen. This union lies in the cervical part of the mediastinum anterior to the cupola. The left subclavian vein arches upward and reaches almost to the lower boundary of the supraclavicular triangle. The area above the subclavian vein can be considered the supraclavicular triangle, whereas the internal jugular vein enters the carotid sheath within the carotid triangle
