What is the differential diagnosis?
- Inflammatory: cervical lymphadenitis, cat-scratch disease, infectious mononucleosis, infection in neck spaces
- Congenital: thyroglossal duct cyst (midline, elevates with tongue protrusion), branchial cleft cysts (lateral), dermoid cysts (midline submental), hemangioma, cystic hygroma
- Neoplastic: primary or metastatic