PMC5629866_01
Patient 1: Computed tomography of the lumbar spine in coronal (left panel, a) and axial (right panel, b) planes that reveal the transitional segments of L5 and pseudoarticulation with the sacral ala
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F1
Imaging studies [computed tomography (CT) and magnetic resonance imaging (MRI)] for both patients revealed anomalous transverse processes at the L5-S1 level and pseudoarticulation with the sacrum, which were consistent with Bertolotti's syndrome [Figure 1].
Navigation workstation-based localization of the transitional segment after incision and soft tissue dissection
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F2
The O-arm was used to localize the L5-S1 transitional segment [Figure 2].
O-arm  images obtained prior to (left panel) and after complete resection of the transitional segment (right panel)
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F3
Adequate resection of the anomalous transverse process was confirmed with the O-Arm [Figure 3; right panel].