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Cernea classification
| Type 1 | The EBSLN crosses the superior thyroid vessels from ≥1 cm above the boundary of the upper pole |
| Type 2a | The EBSLN crosses the superior thyroid vessels from <1 cm above the boundary of the upper pole |
| Type 2b | The EBSLN crosses the superior thyroid pedicle at the level of the upper pole or more caudally |
