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Fig. 4C. —23-year-old man with tingling and paresthesia of right foot who underwent MRI of lumbar spine. Unenhanced axial T1-weighted image (500/25) obtained at inferior L5–S1 intervertebral disk level shows benefit of using curved inner 25-gauge needle as opposed to straight needle. Curved needle (a) pierces posterolateral aspect of intervertebral disk at 90° with final position of its tip in posterior third of nucleus pulposus, as opposed to straight needle (b) that pierces disk tangentially with final position of its tip in annulus of disk. Alternatively, straight inner needle that is tangential to disk margin may get deflected (c) and pass lateral relative to intervertebral disk. Curved arrow marks outer 20-gauge needle, and straight arrow marks exiting nerve.

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