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Cross-table lateral film after failure to obtain CSF, thought to be a dry tap. Note the LP approach at the L4–5 disc space and the needle extended through the disc into the retroperitoneum. At this point, the stylet was removed and no blood was returned. The needle was withdrawn at 5-mm increments, each time checking for arterial or venous blood return. There were no complications, but the diagnostic LP was cancelled until the following day.
