FDG PET scan of an adolescent female who presented with right axillary mass.Notes: Biopsy demonstrated that the tumor was ARMS. FDG PET scan was instrumental in determining that the primary tumor was located in the palmar aspect of the hand (arrow).Abbreviations: FDG PET, 18-fluorodeoxyglucose positron emission tomography; ARMS, alveolar rhabdomyosarcoma.