Extent of lateral neck dissection for papillary thyroid microcarcinomas

Area of Science:

• Oncology
• Surgical Pathology
• Head and Neck Surgery

Background:

• Papillary thyroid microcarcinomas (PTMCs) frequently exhibit lateral lymph node metastasis.
• The extent of lateral neck dissection for PTMCs remains a clinical challenge.

Purpose of the Study:

• To evaluate if primary tumor size is a reliable factor in determining the extent of lateral neck dissection for PTMCs.
• To compare lateral lymph node metastasis patterns between PTMCs and larger papillary thyroid carcinomas (PTCs).

Main Methods:

• Retrospective comparative study of patients with PTMC and PTC (>1 cm).
• Analysis of lateral lymph node dissection outcomes between 2009 and 2015.
• Comparison of clinicopathological features and metastatic patterns.

Main Results:

• PTMCs showed higher rates of metachronous metastasis, multifocality, and lower central/total lymph node metastatic ratios.
• No significant difference was observed in the lateral lymph node metastatic pattern between PTMC and PTC groups.
• Male gender and lymphovascular invasion were associated with synchronous lateral lymph node metastasis in PTMCs.

Conclusions:

• Primary tumor size alone is an unreliable criterion for guiding lateral neck dissection extent in PTMCs.
• Lateral neck dissection strategies should not solely depend on tumor size due to similar metastatic patterns observed in PTMCs and larger PTCs.