Figure 1.

Shamblin classification: (a) Diagram of Shamblin classification of difficulty of CBT resection. Group 1 tumors are localized with minimal attachment to the carotid vessels. Group 2 tumors are generally larger with moderate arterial attachment. Group 3 tumors are also large and encase the carotid vessels, thus presenting the greatest operative challenge and (b) Examples of radiographic Shamblin classification of CBT.

CBT: carotid body tumor; ICA: internal carotid artery; ECA: external carotid artery.