This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
One of the following is a midline neck swelling 
Select and explain. 
A. Carotid body tumor, B. Thyroglossal cyst, C. Branchial cyst, D. Cystic hygroma
B: Thyroglossal cyst
Answer: B: Thyroglossal cyst 
Explanation: Midline swelling of the neck from above downwards Ludwigs angina Enlarged submental lymph nodes Sublingual dermoid Lipoma in the submental region Thyroglossal cyst Subhyoid bursitis Goitre Lipoma & enlarged lymph nodes in the suprasternal space of burns Retrosternal goitre Thymic swelling (A dermoid cyst may occur anywhere in the midline) Ref : Bailey & Love 25/e p729