A 3-year-old boy presents with a midline neck mass that elevates with swallowing and tongue protrusion. Vital signs show BP 100/65, HR 98, RR 22, Temp 37°C, SpO2 98%. Physical examination reveals a smooth, painless 2-cm nodule. Ultrasound demonstrates a cystic lesion at the base of the tongue with clear fluid content. There is no fever, dysphagia, or respiratory distress. Which embryologic structure failed to involute completely?
- A)First pharyngeal pouch
- B)Thyroglossal ductGABARITO
- C)Notochord remnant
- D)Second pharyngeal pouch
- E)Meckel's cartilage
Explicação
The thyroglossal duct is an embryologic structure connecting the developing thyroid at the base of the tongue to the thyroid's final location in the lower neck. Failure of complete involution results in a thyroglossal duct cyst, classically midline, moving wit... Ver explicação completa e trilha adaptativa →