Table 1.

Shamblin classification for CBTs.

Class	Tumor characteristics
I	Smaller tumors, sparse carotid vessel involvement; completely resectable with minimal morbidity
II	Larger tumors, involvement with or possible infiltration of external and internal carotid arteries; complete resection challenging but possible, likely with greater risk of morbidity
III	Large tumors adherent to and surrounding carotid arteries; complete resection almost always requires vessel sacrifice and reconstruction