A Rare Presentation of Synchronous Thyroglossal Cyst and Branchial Cyst in an Adult Male Patient.

The most common congenital cervical masses are thyroglossal cysts followed by branchial cleft anomalies. However, their synchronous presentation is uncommon. A man in his early thirties visited our ear, nose, and throat (ENT) outpatient department (OPD) with complaints of a three-month history of right-side neck swelling. On examination, a 6 cm x 4 cm non-tender, oval-shaped cystic swelling was noted towards the right side of the neck, extending obliquely to the midline. Incidentally, another swelling measuring 2 cm x 1 cm towards the left paramedian of the neck was well-defined, non-tender, cystic in consistency, and moved with deglutition and protrusion of the tongue. Investigations such as fine needle aspiration cytology, ultrasonography, and MRI neck plain and contrast confirmed the diagnosis of a right-sided type 2 branchial cyst with a coexisting thyroglossal cyst. Right branchial cyst excision with Sistrunk procedure was done under general anesthesia. This rare occurrence requires the surgeon to know the embryological basis of such cervical anomalies. We herein report a case of unusual co-occurrence of thyroglossal cyst and branchial cyst in an adult male patient.