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Different Classifications for Different Sites of BPI
| Narakas | Millesi | Alnot | Terzis | |
|---|---|---|---|---|
| Level 1 | Supraganglionic root | Supraganglionic root | Preganglionic root | Root |
| Level 2 | Infraganglionic spinal nerve | Infraganglionic root | Postganglionic root | Supraclavicular postganglionic |
| Level 3 | Infraganglionic trunk | Trunks (supraclavicular) | Supraclavicular and retroclavicular (trunk) | |
| Level 4 | Retroclavicular (division and cord) | Cords (infraclavicular) | Infraclavicular | Infraclavicular |
| Level 5 | Terminal branches |
