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Technique for CT-guided transforaminal blood patching. A, Needle placement before patching. The needle tip is located in the posterior third of the neural foramen, adjacent to a diverticulum of the nerve root (arrow). B, Contrast injected before blood patching confirms the location in the epidural space. C, Image obtained during injection of autologous blood demonstrates displacement of the contrast by the injected blood and mild mass effect on the diverticulum.
