Surgery Which of the following is true about thyroglossal cyst? A Secondary infection leads to sinus. B 40% contains heterotopic thyroid tissue C Resolve spontaneously in 20-30% cases. D Thyroglossal duct obliterates by 18th week of IUL 💡 Explanation Which of the following is true about thyroglossal cyst? ✓ Correct Answer: C. Resolve spontaneously in 20-30% cases.