Table 2. Summary of Radiological, Surgical, and Pathological Findings.
| Patient No./Location | SLNs, No. | SLN Location on SPECT/CT | SLNs on SLNB, No. | SLN Surgical Location | Positive SLNs, No. (Location) | Positive LNs on END, Proportion | Metastatic Deposit | |
|---|---|---|---|---|---|---|---|---|
| On LS | On SPECT/CT | |||||||
| 1/Tongue | 4 | 4 | Right levels I-IV | 4 | Right levels I, II, V | 1 (Right level I) | 0/15 | Micro |
| 2/Tongue | 2 | 4 | Left levels II, III, V | 6 | Left levels I-III, V | 1 (Left level II) | 0/12 | Micro |
| 3/Tongue | 3 | 5 | Right levels II, IV; left level IV | 5 | Right levels II, V; left level V | 1 (Right level V) | 0/11 | Micro |
| 4/FOM | 1 | 2 | Left levels I, III | 1 | Left level V | 0 | 0/17 | None |
| 5/FOM | 4 | 4 | Right levels I, II; left levels I, III | 5 | Right levels I, II; left levels I, III | 3 (Right levels I, II; left level III) | 1/72 | Macro |
| 6/Tongue | 1 | 2 | Right levels II, IV | 3 | Right levels II, III | 1 (Right level II) | 0/10 | Macro |
| 7/Tongue | 2 | 2 | Right level III; left level III | 4 | Right levels II-IV | 1 (Right level III) | 0/20 | Macro |
| 8/Tongue | 2 | 3 | Left levels I, III | 4 | Left levels II-IV | 0 | 0/20 | None |
| 9/Alveolus | 4 | 12 | Right levels I-IV; right parotid; left levels I-III | 11 | Right levels I-III; left levels I-III | 2 (Right levels I, II) | 0/7 | Macro |
| 10/Tongue | 1 | 3 | Right levels II, III | 5 | Right levels II, III | 3 (Right levels II, III) | 0/11 | Micro |
| 11/Tongue | 1 | 4 | Right levels II-IV | 4 | Right levels II, III | 0 | 0/51 | None |
| 12/FOM | 1 | 4 | Right levels I-III | 3 | Right levels I, II | 3 (Right levels I, II) | 0/26 | Micro |
| 13/Tongue | 5 | 1 | Left level II | 9 | Right level IV; left levels I-III | 2 (Left levels II, III) | 0/26 | Macro |
| 14/FOM | 5 | 6 | Right levels II-IV; left levels II, III | 4 | Left levels I-III; right level II | 0 | 0/43 | None |
| 15/Tongue | 3 | 2 | Right levels II, III | 3 | Right levels II, III; left level III | 1 (Right level II) | 0/28 | Micro |
| 16/Alveolus | Error | 4 | Left levels II, IV, V | 5 | Left levels I, II, V | 0 | 0/19 | None |
| 17/Tongue | 4 | 4 | Right levels II, IV | 7 | Right levels II-IV | 3 (Right levels II, III) | 0/15 | Macro |
| 18/Mucosal lip | 4 | 5 | Right levels I, II; left level I | 7 | Right levels I, III; left level I | 0 | 0/19 | None |
| 19/FOM | 7 | 1 | Left level II | 2 | Left levels III, IV | 0 | 0/61 | None |
| 20/Tongue | 2 | 2 | Right levels IV, V | 7 | Right levels II, III | 0 | 0/22 | None |
Abbreviations: END, elective neck dissection; FOM, floor of mouth; LN, lymph node; LS, lymphoscintigraphy; macro, macrometastases; micro, micrometastases; SLN, sentinel lymph node; SLNB, sentinel lymph node biopsy; SPECT/CT, single-photon emission computed tomography/computed tomography.