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A, A 15-year-old boy with SMA type 3. Frontal abdominal radiograph demonstrates diffuse spinal fusion extending to the sacrum. B, With the patient in the left lateral decubitus position, a true-lateral radiograph at the L3–L4 level demonstrates the spinal needle positioned over the posteroinferior aspect of the right neural foramina. C, With the orthogonal view, the spinal needle tip is centered in the thecal sac.
