title: A 22-month-old male child with a painless arm mass presenting to the emergency department.
authors.affiliation: From the Departments of *Radiology and †Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA.
authors.forename: Gregory
authors.initials: G
authors.lastname: Vorona
authors.forename: Fumiko
authors.initials: F
authors.lastname: Dekio
authors.forename: Avrum N
authors.initials: AN
authors.lastname: Pollock
mesh_terms: D001132:Arm; D004636:Emergency Service, Hospital; D006801:Humans; D007223:Infant; D062689:Lipoblastoma / Q000175:diagnosis*; D008297:Male; D012983:Soft Tissue Neoplasms / Q000175:diagnosis*