Left Lateral Neck Dissection for Metastatic Papillary Thyroid Carcinoma

Papillary thyroid carcinoma frequently metastasizes to lateral neck lymph nodes, necessitating compartment-based lymph node dissection following initial thyroidectomy. Surgical education videos provide valuable resources for training surgeons in complex neck dissection techniques. A detailed surgical procedure was documented in a patient with biopsy-proven metastatic papillary thyroid carcinoma in level IV lymph nodes following prior total thyroidectomy and central neck dissection. A compartment-based dissection of levels IIb, III, and IV was performed with preservation of vital neurovascular structures. The procedure was successfully completed with removal of metastatic lymph nodes while preserving the critically important physiological structures throughout the dissection.

Papillary thyroid carcinoma represents the most common malignancy of the thyroid gland, accounting for approximately 80–85% of all thyroid cancers.^1–4 While the prognosis is generally excellent, regional lymph node metastases occur frequently, with lateral neck involvement documented in 10–30% of patients.^5,6

The management of lateral neck metastases in papillary thyroid carcinoma has evolved from "berry-picking" techniques to compartment-based lymph node dissection, which has been demonstrated to reduce recurrence rates and improve oncologic outcomes.^7–9 The lateral neck is divided into levels II through V based on anatomical boundaries, with level IIb (upper jugular), level III (middle jugular), and level IV (lower jugular) most commonly affected in thyroid cancer. Level V lymph nodes, located in the posterior triangle, are less frequently involved in papillary thyroid carcinoma and are typically spared unless specifically indicated by preoperative imaging.¹⁰

Successful lateral neck dissection requires knowledge of cervical anatomy and careful preservation of critical structures including the internal jugular vein, carotid artery, vagus nerve, phrenic nerve, spinal accessory nerve, and thoracic duct. This video presents a detailed step-by-step demonstration of the surgical technique employed in this case.

The procedure began with superior and inferior subplatysmal flaps that were elevated to provide adequate exposure. The superior flap was raised toward the mandible and level IIb region, while the inferior flap was developed to the clavicle for access to level IV lymph nodes. Access to the lateral neck was obtained by separating the medial edge of the sternocleidomastoid from the lateral edge of the sternohyoid muscle. Creation of this space provided direct exposure to the carotid sheath contents, including the carotid artery, internal jugular vein, and vagus nerve, with the target lymph node levels visualized within this region. The omohyoid muscle was identified and divided to improve access to the lymph node compartments. Division of the omohyoid is a standard step in lateral neck dissection and does not result in functional deficit.

The internal jugular vein was carefully dissected circumferentially, with a vessel loop placed for visualization and retraction. Firm, matted metastatic lymph nodes were encountered along the lateral aspect of the vein, particularly in level IV, requiring meticulous hemostatic control due to increased vascularity.

Dissection proceeded superiorly to include level IIb lymph nodes above the cricoid cartilage and level III lymph nodes in the mid-jugular area. The superior extent was determined by preoperative imaging and intraoperative findings. Small lymph nodes adjacent to the internal jugular vein were included to maintain compartment-based dissection principles. The lateral boundary was defined beneath the sternocleidomastoid muscle, avoiding extension into level V. The spinal accessory nerve was identified with nerve monitoring and preserved, with dissection maintained medial to this structure.

The deep boundary was established at the deep cervical fascia overlying the prevertebral and scalene muscles. Dissection beneath this layer was avoided to protect the phrenic nerve. Intraoperative nerve stimulation confirmed phrenic nerve integrity with visible diaphragmatic contraction.

As dissection progressed into level IV, attention focused on the dominant metastatic lymph node and thoracic duct identification. The 2-cm level IV lymph node appeared dark and was positioned lateral to the internal jugular vein, immediately superior to the thoracic duct. Sharp and energy-based dissection were carefully employed with particular caution medially due to proximity of the thoracic duct and vagus nerve.

The inferior extent was completed at the clavicle. The thoracic duct was identified as a thin, translucent structure entering the venous system at the junction of the left internal jugular and subclavian veins. Energy devices were avoided in lower level IV; lymphatic vessels were secured with surgical clips and 2-0 silk ligatures. The duct remained intact throughout.

The lateral margin was finalized at the junction between levels IV and V, avoiding entry into the posterior triangle where the spinal accessory nerve travels. The final attachments to the deep cervical fascia and lateral tissues were divided with sharp dissection. The entire lymph node specimen encompassing levels IIb, III, and IV was removed en bloc.

The specimen was oriented anatomically with suture marking of the superior (levels IIb and III), inferior (level IV with metastatic lymph node), and lateral margins to facilitate pathologic assessment. Following specimen removal, the surgical field was inspected to confirm preservation of critical structures. The internal jugular vein, carotid artery, vagus nerve, phrenic nerve, and thoracic duct were all intact and well-visualized. The wound was irrigated and inspected for bleeding or lymphatic leakage. Final nerve monitoring confirmed preserved vagus and phrenic nerve function.

A surgical drain was not placed, given the limited extent of the dissection and confirmed thoracic duct integrity. The sternohyoid muscle was loosely reapproximated to provide coverage of the carotid sheath without creating excessive tension. The platysma muscle was then closed in a running fashion using absorbable suture, with the patient's head in neutral alignment to ensure accurate tissue approximation. Deep dermal and running subcuticular sutures provided tension-free skin closure, followed by adhesive bandages application.

This case demonstrates the technical principles essential for successful lateral neck dissection in metastatic papillary thyroid carcinoma. The procedure requires thorough understanding of cervical anatomy, careful surgical planning based on preoperative imaging, and meticulous technique to achieve complete oncologic resection while preserving critical neurovascular structures.

Surgical education videos serve multiple functions in modern training. They provide learners with access to complex procedures that may not frequently be encountered and can be reviewed repeatedly to study specific portions of the operation, observe anatomical relationships, and understand the sequence of surgical steps. Narrated videos offer insight into the surgeon's thought process, including how preoperative imaging guides operative planning, how intraoperative findings alter surgical decisions, and how complications are anticipated and avoided. This case exemplifies these educational principles by documenting the systematic approach to compartment-based neck dissection and structure preservation in thyroid cancer surgery.

Nothing to disclose.

The patient referred to in this video article has given their informed consent to be filmed and is aware that information and images will be published online.