Skip metastases in papillary thyroid cancer

Area of Science:

• Oncology
• Surgical Oncology
• Head and Neck Surgery

Background:

• Papillary thyroid carcinoma (PTC) is the most prevalent malignant thyroid neoplasm.
• Cervical metastases are common in PTC, occurring in 30-80% of cases, often involving paratracheal lymph nodes.
• Skip metastasis, defined as lateral lymph node metastasis without central lymph node involvement, represents a distinct pattern of disease spread.

Purpose of the Study:

• To prospectively investigate the pattern of lateral nodal metastasis in papillary thyroid carcinoma.
• To determine the incidence and significance of "skip metastasis" in PTC.
• To analyze the distribution of lateral neck metastases by anatomical level.

Main Methods:

• Prospective study involving 42 treatment-naïve PTC patients diagnosed between 2007 and 2011.
• All patients underwent total thyroidectomy with central and lateral neck dissection.
• Data collected on the presence and location of cervical lymph node metastases.

Main Results:

• Skip metastases were identified in 8 out of 42 patients (19.5%).
• The most frequently involved lateral lymph node levels in skip metastasis were Level III (75%) and Level IV (50%).
• No metastatic involvement was observed in Level IIb lymph nodes in patients with lateral skip metastasis.

Conclusions:

• Skip metastasis is a relatively common occurrence in papillary thyroid carcinoma, present in approximately one-fifth of patients with cervical lymph node metastasis.
• The pattern of lateral nodal involvement in PTC, particularly in the context of skip metastasis, highlights the importance of comprehensive neck dissection.
• Understanding the distribution of skip metastasis aids in surgical planning and risk stratification for PTC patients.