The extent of extrathyroidal extension is a key determinant of prognosis in T4a papillary thyroid cancer

Background and Objectives In papillary thyroid cancer (PTC), the adverse prognostic impact of extrathyroidal extension (macro‐ETE) invading the subcutaneous soft tissues, larynx, trachea, esophagus, or recurrent laryngeal nerve (T4a disease) is well established. We investigated whether the extent of macro‐ETE, defined as “limited” with single structure involvement (lim‐ETE) and “extensive” with multiple structures involved (ext‐ETE), influences...