Table 1. Primary Tumor (T)a
| TX | Primary tumor cannot be assessed. |
| T0 | No evidence of primary tumor. |
| Tis | Carcinoma in situ. |
| Hypopharynx |
| T1 | Tumor limited to 1 subsite of hypopharynx and/or ≤2 cm in greatest dimension. |
| T2 | Tumor invades >1 subsite of hypopharynx or an adjacent site, or measures >2 cm but not >4 cm in greatest dimension without fixation of hemilarynx. |
| T3 | Tumor >4 cm in greatest dimension or with fixation of hemilarynx or extension to esophagus. |
| T4a | Moderately advanced local disease. |
| Tumor invades thyroid/cricoid cartilage, hyoid bone, thyroid gland, or central compartment soft tissue.b |
| T4b | Very advanced local disease. |
| Tumor invades prevertebral fascia, encases carotid artery, or involves mediastinal structures. |
| aReprinted with permission from AJCC: Pharynx. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 41-56. |
| bCentral compartment soft tissue includes prelaryngeal strap muscles and subcutaneous fat. |
