Pharyngeal Cleft Cyst

Pharyngeal cleft cysts are fluid-filled sacs that develop in the neck area due to incomplete closure of the pharyngeal clefts during fetal development. These cysts affect the head and neck region, specifically the structures derived from the branchial apparatus. They usually appear as painless, soft lumps on the side of the neck and can sometimes become infected, causing swelling and discomfort. The cysts are congenital, meaning they are present from birth, but may not be noticed until later in childhood or adulthood. While they do not typically cause serious health problems, they can interfere with swallowing or breathing if they grow large. Diagnosis often involves physical examination and imaging studies to distinguish them from other neck masses. Treatment usually requires surgical removal to prevent recurrent infections or complications.

Pharyngeal cleft cysts are congenital epithelial cysts that arise from incomplete obliteration of the second pharyngeal cleft during embryogenesis. These cysts represent remnants of the branchial apparatus and are lined by stratified squamous or respiratory epithelium. The most common type is the second branchial cleft cyst, located along the anterior border of the sternocleidomastoid muscle. They present as painless, fluctuant masses that may become tender if infected. The pathogenesis involves failure of normal involution of the pharyngeal clefts, leading to cyst formation. Clinically, they are significant because they can mimic other neck masses such as lymphadenopathy or neoplasms and may cause airway or swallowing difficulties if large. Histopathology confirms the diagnosis by demonstrating characteristic epithelial lining and lymphoid tissue in the cyst wall.