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A: Axial CT showing marked ligamentous hypertrophy, (white arrows) which shows up hypointense and darker on T2 MRI.
B: Sagittal T2 MRI with posterior compression from ligamentous stenosis at L4-5.
C: Two RF electrodes placed percutaneously from inferior-laterally to superior-medially in posterior canal within ligamentum flavum.
CT: Computed tomography; MRI: Magnetic resonance imaging; RF: Radiofrequency.
