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17-year-old male with brachialis muscle rupture. (A) Intermediate-weighted axial MRI through the upper arm showing hemorrhage within the deep portion (D) of the brachialis muscle (presumed deep head) with sparing of the superficial head (S). Margins of the brachialis muscle are outlined in black. (B) Mixed signal-intensity hematoma within the substance of the brachialis muscle (white arrow). Note mild strain in the brachioradialis muscle (black arrow).
