Stage III includes: (T3, N0, M0); (T1, N1, M0); (T2, N1, M0); (T3, N1, M0). T3: Tumor 4 cm or larger in greatest dimension or minor bone erosion or perineural invasion or deep invasion. Deep invasion is defined as invasion beyond the subcutaneous fat or larger than 6 mm; perineural invasion for T3 classification is defined as tumor cells within the nerve sheath of a nerve lying deeper than the dermis or measuring 0.1 mm or larger in caliber, or presenting with clinical or radiographic involvement of named nerves without skull base invasion or transgression. T1: Tumor smaller than 2 cm in greatest dimension. T2: Tumor 2 cm or larger, but smaller than 4 cm in greatest dimension. N0: No regional lymph node metastasis. N1: Metastasis in a single ipsilateral lymph node, 3 cm or smaller in greatest dimension and ENE(-). M0: No distant metastasis. (AJCC 8th ed.) [from NCI]