Tumor Size as a Predictive Indicator for Lymph Node Metastasis in Papillary Thyroid Carcinoma: An Inverted L‐Shaped Curve Analysis Based on the SEER Database

Papillary thyroid carcinoma (PTC) frequently metastasises to lymph nodes, with lymph node metastasis (LNM) occurring with high frequency in small, early-stage tumors. The present study examines the inverse l-shaped relationship between tumor size and the likelihood of LNM in patients diagnosed with PTC.