Biopsy is the gold standard for diagnosing thyroid<unk> . According to the American Joint Committee on<unk>  (AJCC), there are 4 stages of<unk>  thyroid<unk>  based on the clinical features and findings on imaging. Each stage is assigned a letter and a number that designate the tumor size, number of lymph node regions involved, and metastasis.
Follicular thyroid cancer diagnostic study of choice
Medullary thyroid cancer other diagnostic studies
Parathyroid adenoma diagnostic study of choice
Thyroid adenoma other diagnostic studies
Anaplastic thyroid cancer echocardiography or ultrasound
Toxic multinodular goiter other diagnostic studies
Medullary thyroid cancer echocardiography or ultrasound
Thyroid nodule other diagnostic studies