^(18)F-FDG PET/CT findings of paratesticular alveolar rhabdomyosarcoma

Rhabdomyosarcoma(RMS)originates from primitive mesenchymal cells and is the most common soft tissue tumor in childhood.^(18)F-fluoro-deoxyglucose(^(18)F-FDG)positron emission tomography(PET)/computed tomography(CT)has been reported to be valuable in RMS staging and risk stratification.Paratesticular RMS is a relatively uncommon form of RMS,most of which are of the embryonal histologic type.Paratesticular alveolar RMS is associated with aggressive behavior,high metastatic potential,and poor outcomes.To the best of our knowledge,^(18)F-FDG PET/CT imaging findings of paratesticular alveolar RMS have never been described.Here,we report on a 16-year-old boy's rare paratesticular alveolar RMS with multiple metastases and its findings on^(18)F-FDG PET/CT.This case also demonstrates the potential value of^(18)F-FDG PET/CT in RMS staging and treatment decisions,and may aid in the differential diagnosis.