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A 13-year-old female with a palpable mass in the left upper arm. a An axial T2-weighted image demonstrates an iso- to moderate-intensity, well-circumscribed, round mass within the subcutaneous tissues adjacent to the triceps brachii muscle. b Coronal T1 fat-saturated post-gadolinium MR image demonstrates the strong enhancement of this lesion. A biopsy scar is visible outside the tumor (white arrow).
