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A, A 14-year-old girl with SMA type 2 and an abdominal radiograph demonstrating thoracolumbar spinal rods extending to the sacrum with posterior spinal osseous fusion. B, Conebeam CT using XperCT guidance software (Philips Healthcare) (green dashed line) to access the thecal sac via a right L3–L4 transforaminal approach. C, XperCT fluoroscopic overlay “progress” view used to determine needle tip position depth in the thecal sac.
