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BACKGROUND The morbidity of papillary thyroid carcinoma (PTC) is primarily related to locoregional recurrences and distant metastases. The definition of minimal extrathyroidal extension (mETE) has been recently revised. The presence of mETE does not impact mortality and is generally not thought to be a predictor for risk of recurrence. This study aimed at comparing risk of recurrence and response to therapy of PTC with mETE and gross ETE into the strap muscles (gETE) to low- and intermediate-risk PTC without ETE (low w/o ETE and interm