I’ll be frank, I don’t have all the details on this but the findings are clear on this animated gif. If you watch carefully, you can see the pulsation artifact at the site of leak. There is a rent in the dura and pseudomeningocele in the dorsal soft tissues.
I’m guessing this was a laminectomy for a bony septum producing symptoms. I have seen these on myelography where the dye pours out as soon as it’s injected.