Thyroglossal Cyst

A 5-year-old child presents with a painless, soft, mobile swelling in the midline of the neck, just below the hyoid bone. The swelling moves upwards on protrusion of the tongue. What is the most likely diagnosis?

A thyroglossal duct cyst arises from the persistent remnant of which embryological structure?

The definitive surgical procedure for a thyroglossal duct cyst, which involves excision of the cyst along with the central portion of the hyoid bone and a core of tissue up to the foramen cecum, is known as:

The characteristic upward movement of a thyroglossal duct cyst on tongue protrusion is primarily due to its anatomical relationship with which of the following structures?

A 45-year-old male presents with a long-standing, recurrently infected midline neck swelling diagnosed as a thyroglossal duct cyst. Biopsy of a suspicious nodule within the cyst reveals malignancy. What is the most common histological type of carcinoma found in a thyroglossal duct cyst?