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TECHNIQUE: Risks and potential complications were explained and a informed was written consent. Patient was placed on prone position on fluoroscopy table. Back prepped and draped in usual sterile fashion. 1% Lidocaine was used for Local anesthesia.[ L2-3 or L3-4] interspace was localized. Under fluoro guidance, a G spinal needle was advanced along the right paramidline interlaminar space into the thecal space with a single pass. Needle placement was confirmed with passive flow of clear CSF. Opening pressure was measured to be cm of water. cc CSF was collected and sent to lab for analysis. [12cc] of  was introduced into thecal sac. Subsequently, CT scan was performed from [T12-S1]. No immediate post-procedure complications.