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Shamblin classification of carotid body tumors [11]
| Type 1 | Tumors are small lesions, that do not splay the carotid bifurcation |
| Type 2 | Tumors are larger, significantly splay the carotid bifurcation, but do not circumferentially encase the carotid arteries |
| Type 3 | Tumors are large, encapsulate the internal or external carotid arteries and often adhere or incorporate the adjacent cranial nerves |
