Computed Tomography Findings of Complete Branchial Cleft Fistula.

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Branchial cleft anomalies are embryonic remnants of the branchial arches and are described as the second most common congenital neck mass. Depending on their extent, these anomalies are classified as a cyst, sinus, or fistula with branchial cysts being the most common. Branchial cysts deriving from the second branchial arch are by far the most common, accounting for approximately 95% of all cases. Complete second branch arch fistulas with both an internal and external opening are a rare variant of this anomaly, and even less have been well-documented on computed tomography (CT) imaging in the literature. We present here a case of a 20-year-old female with CT findings consistent with a complete second branchial arch fistula extending from the tonsillar fossa to the external lateral neck.

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