Fig. 2From: Significant value of 18F-FDG-PET/CT in diagnosing small cervical lymph node metastases in patients with nasopharyngeal carcinoma treated with intensity-modulated radiotherapyKaplan-Meier DMFS and OS curves stratified by MRI-diagnosed N category (a) and overall stage (b), and PET/CT-diagnosed N category (c) and overall stage (d). Numbers in the figure are P values. DMFS distant metastasis-free survival, OS overall survival, MRI magnetic resonance imaging, PET/CT positron emission tomography/computed tomographyBack to article page