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Low lumbar lordosis angle 117.86°of the same patient as Figure 5. The sagittal plane image demonstrated degenerative lower lumbar slippage (bifid arrow). The iliac vein tunnel (IVT) became narrow owing to the forward shift intervertebral disc of the fourth and fifth vertebral bodies, which caused the iliac vein compression (arrow). Thus, the IVT of the patient was considered secondum stenosis.
