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McGill algorithm for workup of indeterminate thyroid nodules. AUS: Atypia of undetermined significance; ETE: Extrathyroidal extension; FLUS: Follicular lesion of undetermined significance; FN: Follicular neoplasm; HCLUS: Hurthle cell lesion of undetermined significance; LN: Lymph node; ThyCa: Thyroid cancer; TI-RADS: Thyroid Imaging Reporting and Data System; U/S: Ultrasound; USFNA: Ultrasound-guided fine-needle aspiration.
