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A case of patient suffering initially from allodynia and later a mass on the right elbow, which was pathologically confirmed as epithelioid sarcoma with ulnar nerve injury. (A) PET/CT showing the affected area; (B) coronal plane of the mass adjacent to ulnar nerve, red arrow marks the mass; (C) sagittal plane of the mass and the ulnar nerve, yellow arrow marks the swelling of the ulnar nerve; (D) intraoperative image of mass excision and nerve preservation.
