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MRI sequences show a large heterogeneous lobulated mass in the right subpectoral region, encircling the subclavian artery and brachial plexus. This mass measures 10.5 x 9.5 x 11.0 cm. It is isointense in T2, hyperintense in T2 FS and enhances heterogeneously after contrast administration.
There is also significant intermuscular and soft tissue edema and lymphadenopathy.