MRI carotid body paraganglioma

(A) CBT (class I): The axial T1-weighted MRI with contrast medium shows a CBT in typical location. Splaying of the left carotid bifurcation without any surrounding of the carotid vessels (arrows).
(B) CBT (class II): Axial T1-weighted MRI with contrast showing a right-sided CBT partially surrounding the internal and external carotid artery (arrows).
(C) CBT (class III): A large left-sided CBT intimately surrounding the carotid vessels (arrow) (axial T1 weighted MRI with contrast).