Head & Neck Staging: Table Five

Salivary Glands (C07, C08)
TNM Classification Histological/Clinical Features
T1 2 cm or less without extraparenchymal extension
T2 >2cm but <4cm without extraparenchymal extension
T3 >4cm and/or extraparenchymal extension
T4a Invades skin, mandible, ear canal, and/or facial nerve
T4b Invades skull base and/or pterygoid plates and/or encases carotid artery

Thyroid Gland (C73)
TNM Classification Histological/Clinical Features
T1 2cm or less limited to thyroid
T2 >2cm but <4cm limited to thyroid
T3 >4cm limited to thyroid or any tumor with minimal extrathyroid extension
T4a Extending beyond thyroid capsule to invade subcutaneous soft tissue, larynx, trachea, esophagus or recurrent laryngeal nerve
T4b Invades prevertebral fascia or encases carotid artery or mediastinal vessels