Thyroid cancer staging

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Thyroid cancer staging is done with the TNM staging system.

TNM staging system

Tumour stage not including anaplastic carcinoma

T stage Size/criteria Other requirements Comment
pT1a 1 cm or less limited to thyroid very common
pT1b >1 cm and <2 cm limited to thyroid
pT2 >2 cm and <4 cm limited to thyroid
pT3 >4 cm and limited to thyroid or "minimal" extrathyroidal extension "minimal" extrathyroidal extension = sternothyroid m. or perithyroidal tissue
pT4a any size any of the following: subcutaneous tissue, trachea, esophagus, larynx, recurrent laryngeal nerve
pT4b any size any of the following: mediastinal vessels, encasing carotid artery, prevertebral fascia

See also