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Given that Kawasaki disease (KD) can cause cardiac complications, it is crucial to diagnose and treat the disease in the emergency department. We report a case of a 10-year-old girl who presented to the emergency department with cervical lymphadenopathy and fever. The initial diagnosis was retropharyngeal abscess based on computed tomography findings, but antibiotic therapy failed and she was subsequently diagnosed with KD. After 3 doses of intravenous immunoglobulin along with methylprednisolone and methotrexate, she was discharged on hospital day 21. The cervical lymphadenopathy suggesting retropharyngeal abscess might be an early sign of incomplete or intravenous immunoglobulin-resistant KD.