Harlequin syndrome and Horner syndrome after neck schwannoma excision in a pediatric patient: A case report.

RATIONALE: Harlequin syndrome is an extremely rare benign condition characterized by unilateral facial flushing and sweating.

PATIENT CONCERN: An 11-year-old boy presented with complaint of a right neck mass of 1-month duration.

DIAGNOSIS: The preoperative diagnosis was neurogenic tumor of vagus nerve or sympathetic nerve.

INTERVENTIONS: We performed right neck mass removal under general anesthesia.

OUTCOMES: We report a case of harlequin syndrome associated with Horner syndrome in an 11-year boy who underwent excision of right neck schwannoma.

LESSONS: Clinicians should consider the point that harlequin syndrome could occur as a first sign of more serious conditions.