Table 1:

Discrepancy cases between imaging and surgery, with a description of the imaging findings

No.Disk LevelImagingSurgicalDescription
14/5ExtrusionProtrusionOn sagittal images, the height of the abnormal disk is slightly greater than the disk height
22/3ExtrusionExtrusion and sequestrationAlthough imaging suggests a sequestered fragment, there is a thin continuity between the disk fragments visible on MR imaging (Fig 1)
34/5ExtrusionProtrusionOn sagittal images, the height of the abnormal disk is slightly greater and very close in distance to the maximum disk height
44/5ExtrusionProtrusionOn sagittal images, the height of the abnormal disk is very close in distance to the maximum disk height (Fig 2)
54/5ExtrusionExtrusion and sequestrationSagittal images show a connection between disk fragments
64/5ExtrusionProtrusionOn sagittal images, the abnormal disk appears contained by the outer annulus, but the height of the annulus is slightly greater than the disk height
74/5ExtrusionProtrusionOn sagittal images, the height of the abnormal disk is slightly greater than the disk height
85/1ExtrusionProtrusionOn sagittal images, the height of the abnormal disk is slightly greater than the disk height
95/1ProtrusionExtrusionOn the sagittal view, the low signal of the disk and annulus is very difficult to differentiate (Fig 3)
104/5ExtrusionProtrusionOn sagittal images, the height of the abnormal disk is very similar to the disk height
114/5ProtrusionExtrusionOn the sagittal view, the low signal of the disk and annulus is very difficult to differentiate
124/5ProtrusionExtrusionOn sagittal images, the entire annulus is not clearly defined
135/1ProtrusionExtrusionOn sagittal images, the abnormal disk height is similar to the maximum disk height
144/5ExtrusionProtrusionOn sagittal images, the abnormal disk height is slightly greater than the maximum disk height
155/1ExtrusionProtrusionOn the sagittal view, abnormal disk height is much greater than the normal disk height and the outer annulus appears disrupted; in retrospect, the diagnosis is still extrusion by imaging criteria (Fig 4)
164/5ExtrusionSequestrationImaging shows a thin connection between the parent disk and disk the fragment