Table 1. Primary Tumor (T)a

TXPrimary tumor cannot be assessed.
T0No evidence of primary tumor.
TisCarcinoma in situ.
T1Tumor limited to 1 subsite of hypopharynx and/or ≤2 cm in greatest dimension.
T2Tumor invades >1 subsite of hypopharynx or an adjacent site, or measures >2 cm but not >4 cm in greatest dimension without fixation of hemilarynx.
T3Tumor >4 cm in greatest dimension or with fixation of hemilarynx or extension to esophagus.
T4aModerately advanced local disease.
Tumor invades thyroid/cricoid cartilage, hyoid bone, thyroid gland, or central compartment soft tissue.b
T4bVery 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.

PubMed Health. A service of the National Library of Medicine, National Institutes of Health.