Abstract
Introduction: Second branchial cleft cysts are rare congenital cervical lesions, accounting for approximately 2% of neck tumors. Submental extension is exceptionally rare and may pose a diagnostic challenge.
Case Report: A 55-year-old man presented with a painless submental swelling that had progressively enlarged over five years. Imaging revealed a well-defined cystic lesion arising from the left submandibular region with marked submental extension. Complete surgical excision was performed through a cervicotomy. Histopathological examination confirmed a second branchial cleft cyst.
Conclusion: This rare presentation should be considered in the differential diagnosis of submandibular cystic masses. Complete surgical excision is both diagnostic and curative.
Keywords: Second branchial cleft cyst, Atypical location, Submental extension, Cervicotomy.