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Two-level interlaminar epidural steroid injections (ILESIs) at L3/4 and L5/S1.
The first three images refer to the L3/4 injection. The first image shows the position and trajectory of the 22G Tuohy needle, which in the centre of the left para-midline interlaminar space. The second image is the final precontrast needle position, the third after iodinated contrast has been injected, which confirms the needle tip is in the dorsal epidural space.
The fourth and fifth images are from the L5/S1 injection. The fifth is a post-contrast image and shows contrast extending into the dorsal epidural space.