Question:
A 50-year-old patient presents with a slowly growing, painless neck mass at the angle of the mandible. “Lyre's sign” is observed. What is the most likely diagnosis?
A 50-year-old patient presents with a slowly growing, painless neck mass at the angle of the mandible. “Lyre's sign” is observed. What is the most likely diagnosis?
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Neck mass at carotid bifurcation with Lyre's sign = carotid body tumor.
Updated On: May 14, 2026
- Thyroid nodule
- Lymphadenopathy
- Carotid body tumor
- Branchial cyst
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The Correct Option is C
Solution and Explanation
Concept:
Carotid body tumor is a paraganglioma located at the carotid bifurcation. On angiography, it splays the internal and external carotid arteries, producing the classic Lyre's sign.
Step 1: Identify the mass location.
A painless neck mass near the angle of the mandible suggests a lesion near the carotid bifurcation.
Step 2: Use the specific sign.
Lyre's sign is due to splaying of carotid arteries.
Step 3: Select the diagnosis.
The condition classically associated with Lyre's sign is: \[ \text{Carotid body tumor} \] Therefore, the correct answer is Carotid body tumor.
Step 1: Identify the mass location.
A painless neck mass near the angle of the mandible suggests a lesion near the carotid bifurcation.
Step 2: Use the specific sign.
Lyre's sign is due to splaying of carotid arteries.
Step 3: Select the diagnosis.
The condition classically associated with Lyre's sign is: \[ \text{Carotid body tumor} \] Therefore, the correct answer is Carotid body tumor.
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