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Patients with 3 MR imaging–determined risk factors are at high risk for local control (1-year local control rate, 0%). MR imaging risk factors are large tumor volume (>4 mL), subglottic extension, and low degree of enhancement. No risk factors (n = 10), 1 risk factor (n = 24), 2 risk factors (n = 22), 3 risk factors (n = 8). No factors versus 1 factor (P = .6), no factors versus 2 factors (P = .1), no factors versus 3 factors (P = .001).
