Excision of the hyoid bone is done in
**Core Concept**
The hyoid bone is a critical anatomical structure located in the anterior neck, serving as an attachment point for various muscles and ligaments. In certain clinical scenarios, surgical excision of the hyoid bone is necessary to address specific pathologies.
**Why the Correct Answer is Right**
The correct answer, **C. Thyroglossal cyst**, involves the surgical procedure known as the Sistrunk procedure. This procedure involves the complete excision of the thyroglossal duct cyst, which includes the hyoid bone. The thyroglossal duct cyst is a congenital anomaly that forms as a result of the embryological development of the thyroid gland. The Sistrunk procedure is the gold standard for treating thyroglossal duct cysts, as it reduces the risk of recurrence by removing the tract of the thyroglossal duct, which extends from the foramen cecum of the tongue to the hyoid bone.
**Why Each Wrong Option is Incorrect**
* **Option A:** Excision of the hyoid bone is not typically performed for branchial cysts, which are congenital anomalies that occur along the branchial clefts. The treatment for branchial cysts usually involves simple excision of the cyst without removal of the hyoid bone.
* **Option B:** Branchial fistulas, which are congenital anomalies that occur along the branchial clefts, do not typically require excision of the hyoid bone. Treatment for branchial fistulas usually involves simple excision of the fistula tract.
* **Option D:** Sublingual dermoids are congenital anomalies that occur under the tongue and do not typically require excision of the hyoid bone. Treatment for sublingual dermoids usually involves simple excision of the dermoid cyst.
**Clinical Pearl / High-Yield Fact**
The Sistrunk procedure for thyroglossal duct cysts involves the complete excision of the cyst, the central part of the hyoid bone, and the tract of the thyroglossal duct. This procedure is essential to prevent recurrence and reduce the risk of complications.
**Correct Answer Line**
✓ Correct Answer: C. Thyroglossal cyst.