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Case 40: RCC metastasis at T12-L2. a: Preoperative enhanced MRI showing extracompartmental tumor at L1 level. b: Lateral radiograph immediately after surgery showing no cage subsidence. c, d: Lateral radiograph (c) and sagittal CT reconstruction (d) at 15 months after surgery, demonstrating severe cage subsidence and screw back-out. e, f: Radiograph after revision surgery.
