4. Contrast medium is slowly injected (no faster than 1 mL/ second).a. If CSF flow is present, administer full dose and proceed with radiography.b If needle placement is in doubt, make a small injection (0.5-1.OmL) followed by a lateral radiograph to evaluate needle placement (be careful not to inadvertently move a correctly placed needle).5. Make a lateral radiograph immediately following injection:a. Needle can remain in place or be removed for this initial radiograph.b. If needle remains in place, take care not to move head and neck.6. Needle is removed prior to making VD and any additional radiographs (e.g., DV, oblique, extended lateral, flexed 1 lateral). I I7. Cranial end of animal may be raised to improve flow of contrast medium caudally. If contrast does not flow well, cranial portion of neck can be flexed and released, whichwill sometimes change dynamics and allow flow (exercise caution because extreme flexion can increase severity of clinical signs).
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