This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Radiology
Lyre sign is seen in- 
Select and explain. 
A. Meningioma, B. Acoustic neuroma, C. Sagittal sinus thrombosis, D. Carotid body tumor
D: Carotid body tumor
Answer: D: Carotid body tumor 
Explanation: Ans. is 'd' i.e., Carotid body tumor * Lyre sign refers to splaying of the internal and external carotid artery at the bifurcation of the common carotid artery caused by carotid body tumor. Classically described on angiography it is also visible on CT angiography.