A 4-week-old male infant presents to the pediatrician with a firm, painless midline neck mass that the parents first noticed 2 weeks ago. On examination, the mass is located between the hyoid bone and thyroid cartilage. When the infant swallows, the mass moves upward; similarly, when the tongue is protruded, the mass moves superiorly. Ultrasound shows a 1.5-cm cystic lesion with homogeneous fluid content and no internal vascularity. The infant has no fever, stridor, or dysphagia. Thyroid function tests are normal. Which of the following embryologic structures failed to regress completely, resulting in this presentation?
- A)Remnant of the first pharyngeal pouch
- B)Remnant of the second pharyngeal pouch
- C)Incomplete obliteration of the thyroglossal ductGABARITO
- D)Remnant of the third pharyngeal pouch
- E)Ectopic thyroid tissue from aberrant descent
Explicação
The thyroglossal duct is an embryologic structure that normally connects the developing thyroid gland at the base of the tongue (foramen cecum) to its final position in the lower neck. This duct should completely regress by approximately 7-10 weeks of gestatio... Ver explicação completa e trilha adaptativa →