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I did an uneventful lumbar L1-3 RFA. A few days later the patient complains of a headache, described as her head is too heavy, better when laying down and worse on the left side. I sit on it for a few weeks to see if it gets better and it doesn't. In clinic she has very mild facet loading and I figure it was related to her positioning during the procedure and that aggravated her neck. One moth goes by so I order a c spine MRI looking for any abnormalities. Nothing too severe. I then tell her she should have further workup with PCP for primary causes of headaches. They perform ct angio and MRI brain without any abnormalities. I'm thinking about either MBB to see if this is facet mediated v sending to neurology. Any other thoughts? Both her and PCP are asking about PDPH and I don't see how that is possible. Any further thoughts/work up you would do?