Table 1. Primary Tumor (T)a
| TX | Primary tumor cannot be assessed. |
| T0 | No evidence of primary tumor. |
| T1 | Tumor ≤2 cm in greatest dimension without extraparenchymal extension.b |
| T2 | Tumor >2 cm but ≤4 cm in greatest dimension without extraparenchymal extension.b |
| T3 | Tumor >4 cm and/or tumor having extraparenchymal extension.b |
| T4a | Moderately advanced disease. |
| Tumor invades skin, mandible, ear canal, and/or facial nerve. |
| T4b | Very advanced disease. |
| Tumor invades skull base and/or pterygoid plates and/or encases carotid artery. |
| aReprinted with permission from AJCC: Major salivary glands (parotid, submandibular, and sublingual) . In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 79-86. |
| bExtraparenchymal extension is clinical or macroscopic evidence of invasion of soft tissues. Microscopic evidence alone does not constitute extraparenchymal extension for classification purposes. |
