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Table 1. Primary Tumor (T)a

TXPrimary tumor cannot be assessed.
T0No evidence of primary tumor.
T1Tumor ≤2 cm in greatest dimension without extraparenchymal extension.b
T2Tumor >2 cm but ≤4 cm in greatest dimension without extraparenchymal extension.b
T3Tumor >4 cm and/or tumor having extraparenchymal extension.b
T4aModerately advanced disease.
Tumor invades skin, mandible, ear canal, and/or facial nerve.
T4bVery 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.