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Planning a needle trajectory on a young patient. Panel (a) shows 10° left oblique and 10° caudal angulation to widen the interlaminar space at L2–3. Bull’s eye needle view (b) with an ideal needle trajectory for LP. With lateral imaging (c), the needle is not yet in the thecal sac. Removal of the stylet will not yield CSF. The needle should be advanced to the center of the spinal canal.
