Figure 2: Axial T2 image through the level of the sacrum demonstrates an isointense lesion originating in the right sacral ala which is invading the S1 and S2 exiting nerve roots. (double red arrows).
骶骨轴位T2序列显示起源于右侧骶骨翼的等信号的病灶，病变浸润骶1、2椎体外侧神经根。
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