Definition

The tumor (1) is larger than 2 centimeters but not larger than 4 centimeters and the deepest point of tumor invasion is greater than 10 millimeters; or (2) is larger than 4 centimeters and the deepest point of tumor invasion is 10 millimeters or less; or (3) has spread to one lymph node that is 3 centimeters or smaller, on the same side of the neck as the primary tumor.