Prognostic Value of Classifying Parapharyngeal Extension in Nasopharyngeal Carcinoma Based on Magnetic Resonance Imaging

Figure 3

OS (a), LRFS (b), and DMFS (c) curves for patients with NPC stratified according to grade of parapharyngeal extension and T category. G1: mild parapharyngeal extension; G2: T3 without extensive parapharyngeal extension; G3: all T4 (excluding patients staged as T4 because of masticator space invasion); G4: extensive parapharyngeal extension.

(a)

(b)

(c)