Carotid body tumors (paragangliomas) at the carotid bifurcation are characterized by which angiographic finding?
- A Blush within the carotid bulb with no vessel displacement
- B Occlusion of the internal carotid artery with collateral formation
- C Splaying (lyre sign) of the internal and external carotid arteries by a hypervascular mass ✓
- D Aneurysmal dilatation of the common carotid artery
Correct answer: C. Splaying (lyre sign) of the internal and external carotid arteries by a hypervascular mass
Explanation
Carotid body tumor on angiography (CT angiography or conventional angiography) shows the pathognomonic 'lyre sign' — splaying or widening of the bifurcation angle between the internal and external carotid arteries by the hypervascular mass, which sits at the carotid bifurcation. The tumor has intense vascular blush but does not occlude the carotid. This splaying appearance is highly characteristic and distinguishes it from lymph node enlargement.
Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.
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