Presentation
Left neck swelling for many years
Patient Data
Large soft tissue mass located within the left carotid space and the epicenter at the left carotid body. It demonstrates rapid and avid enhancement post-contrast study. It causes splaying of the left internal carotid artery(ICA) and left external carotid artery (ECA), in keeping with Lyre sign. The mass encases the left ICA for more than 270 degrees (Shamblin classification group III). No visualization of the normal left internal jugular vein, likely due to external compression by this mass.
Superior extension of this mass into the left jugular foramen, but no obvious intracranial extension.
No other abnormally enhancing soft tissue lesion at bilateral middle ear cavities, right jugular foramen and right carotid space to suggest a synchronous tumor.
Case Discussion
Imaging features are most compatible with carotid body paraganglioma.
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