Evaluation of a unilateral neck mass in a 16-year-old female: Kikuchi-Fujimoto disease with superimposed bacterial lymphadenitis.

The evaluation of pediatric neck masses offers the opportunity for consideration of a diverse range of pathologies, from infectious to neoplastic. A 16-year-old female presented with 2 weeks of worsening swelling and pain of a left-sided neck mass. Findings were consistent with Epstein-Barr virus and cytomegalovirus coinfection, but considering profound lymphadenopathy of the supraclavicular, mammillary, and axillary chains, further investigations were undertaken.