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Table 2 Metastatic rates of small cervical lymph nodes based on MRI and PET/CT findings

From: Significant value of 18F-FDG-PET/CT in diagnosing small cervical lymph node metastases in patients with nasopharyngeal carcinoma treated with intensity-modulated radiotherapy

Level Group A (≥ 5 and < 6 mm) Group B (≥ 6 and < 7 mm) Group C (≥ 7 and < 8 mm) Group D (≥ 8 and < 9 mm) Group E (≥ 9 and < 10 mm) P e
Totala Metastatic lymph nodes (%)b Totala Metastatic lymph nodes (%)b Totala Metastatic lymph nodes (%)b Totala Metastatic lymph nodes (%)b Totala Metastatic lymph nodes (%)b
Ic 197 0 (0) 70 0 (0) 34 2 (5.9) 10 2 (20.0) 3 3 (100.0) < 0.001
II 396 17 (4.3) 329 30 (9.1) 263 80 (30.4) 167 94 (56.3) 111 91 (82.0) < 0.001
III/Va 170 8 (4.7) 91 8 (8.8) 58 23 (39.7) 34 24 (70.6) 12 11 (91.7) < 0.001
IV/Vb 45 3 (6.7) 36 4 (11.1) 19 12 (63.2) 26 22 (84.6) 11 10 (90.9) < 0.001
P d1 0.018 0.005 < 0.001 0.001 0.487  
P d2 0.768 0.915 0.008 0.011 0.503  
  1. MRI magnetic resonance imaging, PET/CT positron emission tomography/computed tomography
  2. aTotal number of small cervical lymph nodes based on MRI findings
  3. bThe number of metastatic small cervical lymph nodes based on PET/CT findings
  4. cThere were 184 (93.4%) in the level Ib and 13 (6.6%) in the level Ia for group A. No small cervical lymph nodes were observed in level Ia for the other groups
  5. P d1 : Comparison between levels I, II, III/Va, and IV/Vb; P d2 : Comparison between levels II, III/Va, and IV/Vb
  6. eComparison between groups A, B, C, D and E. P values are calculated by Chi square test or Fisher’s exact test