Abstract
We present a case report describing an unexpected anomaly encountered during a total thyroidectomy for a patient with papillary carcinoma of the left lobe of the thyroid with retrosternal extension. Intraoperatively, we discovered that the left lobe of the thyroid gland had extended posteriorly, invading the carotid space and displacing the carotid sheath anteriorly. The vagus nerve was identified as a cord-like structure abutting the anterior surface of the tumor, in close relation to the strap muscles. This case highlights the importance of careful dissection and identification of anatomical structures during thyroidectomy procedures to avoid inadvertent nerve injury. We discuss the significance of meticulous dissection-wide exposure and advocate for greater awareness and vigilance among surgeons.