Question 2 of 18

This MRCS Part B station tests your knowledge of the anatomy of the thyroid gland and surrounding structures. For more Anatomy practice, head to Acland's via the link above (Pass the MRCS members get access for free)

Explain how thyroglossal cysts are formed

- During embryological development, the thyroid descends from the tongue base to its position in the neck through the thyroglossal duct. Thyroglossal cysts occur when the duct fails to regress.  

- A thyroglossal cyst is a differential for a midline neck mass. It will rise up on protrusion of the tongue on examination.

- During removal, the middle 1/3 of the hyoid bone should also be excised to prevent recurrence.