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SG Classification
| Type | Localization | Anatomy |
|---|---|---|
| I | Anterior mediastinum | Located on anterior of the trachea, major vessels and RLN |
| II | Posterior mediastinum | Located on posterior of the trachea, major vessels and RLN |
| IIA | Ipsilateral enlargement | |
| IIB | Contralateral enlargement | |
| IIB1 | Enlargement to both posterior trachea and posterior esophagus | |
| IIB2 | Enlargement to between trachea and esophagus | |
| III | Mediastinal Goiter Only | Unrelated to the cervical thyroid |
