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Click A 70-year-old woman with Vertebral Artery Loop Formation. T1-weighted axial magnetic resonance images without contrast, from C3 to C7 levels, show signal-void vascular structures in the right C4-5 and in the left C5-6 intervertebral foramina. (Protocol: GE Signa HD 1.5 T, TE 19 ms, TR 500 ms)

Click A 70-year-old woman with Vertebral Artery Loop Formation. T2-weighted axial magnetic resonance images without contrast, from C3 to C7 levels, show signal-void vascular structures in the right C4-5 and in the left C5-6 intervertebral foramina. (Protocol: GE Signa HD 1.5 T, TE 107 ms, TR 3820 ms)

Click A 70-year-old woman with Vertebral Artery Loop Formation. Three Dimension Time Of Flight Magnetic Resonance Angiography without contrast (3D TOF MRA) axial images show bilateral vertebral artery loop formation (VALF) in C5-6 left intervertebral foramen and C4-5 right intervertebral foramen (arrows). (Protocol: GE Signa HD 1.5 T, TE 2.8 ms, TR 23 ms, FA 25, NEX =1, slice thickness 1.5 mm)

Click A 70-year-old woman with Vertebral Artery Loop Formation. Axial non contrast CT scan of the cervical spine obtained from the level C3-4 to the level C7-D1 shows widened left C5-6 intervertebral foramen and erosion of the adjacent bony structures. (Protocol: Philips Brilliance 16 multislice, KV 140, mA range 280-715, slice thickness 1.25 mm)

Click A 70-year-old woman with Vertebral Artery Loop Formation. Axial non contrast CT scan of the cervical spine obtained from the level C3-4 to the level C7-D1 in soft tissue window shows soft tissue density within the widened left C5-6 intervertebral foramen and erosion of the adjacent bony structures. (Protocol: Philips Brilliance 16 multislice, KV 140, mA range 280-715, slice thickness 1.25 mm)