Unusual Location Of A Second Branchial Cleft Cyst Presenting In The Suprasternal Notch

Background Second branchial cleft cysts (SBCCs) are congenital benign tumors that comprise up to 90% of all branchial cleft anomalies. SBCCs typically present in the lateral neck along the anterior border of the upper third of the sternocleidomastoid muscle. We describe a case of a SBCC presenting in an unusual location in the lower neck close to midline.Methods An 18-year-old male presented with a 2-year history of a neck mass in the suprasternal notch. Imaging findings were reviewed with a head and neck radiologist who felt that the findings were highly suggestive of a fourth branchial cleft cyst.Results The patient underwent surgical excision of the mass. Final pathologic evaluation confirmed the diagnosis of a second branchial cleft cyst.Conclusions Though extremely uncommon, second branchial cleft cysts can extend to the suprasternal notch and should not be excluded from the differential diagnoses of lower neck masses.