This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous ENT, Subject name: ENT
Lyre sign is seen in 
Select and explain. 
A. Thyroglossal fistula, B. Carotid body tumor, C. Carcinoma maxilla, D. Abdominal aoic aneurysm
B: Carotid body tumor
Answer: B: Carotid body tumor 
Explanation: Carotid body tumour arises from the chemoreceptor cells in the carotid body, hence also called chemodectoma. Mostly presents after 40 years. It is a very slow-growing tumour and the history of mass in the neck may extend into several years. It presents as a painless swelling which is pulsatile.MRI angiography shows splaying of internal and external carotid aeries (Lyre's sign).Dhingra 6e pg: 392