<prompt> A 50-year-old lady with thyroid swelling is diagnosed to have papillary carcinoma with mass having 4 cm at greatest diameter and invading strap muscles. Lymph node status was negative. What will be the stage of the disease?Stage IStage IIStage IIIStage IV  <response>: Extrathyroidal extension into strap muscles is T3b, Lymph node status is N0.Patients with below 55 years any T and any N with Mo no metastasis is taken as Stage IIf patient was above or 55 years age, would have been stage IIT12cmT2 2-4 cmT3a 4cmT3bExtrathyroidal extension into strap musclesT4Gross extrathyroidal extensionThis was recent update in AJCC 8th classification, previously cut off age was 45 yearsRef: AJCC 8th edition 