Tap more info8/11/2023 ![]() Your provider may also recommend a CT scan or MRI to determine if you have any abnormal swelling in or around your brain. A detailed neurological examination can also help rule out a significant space-occupying lesion.īefore your lumbar puncture (spinal tap), your health care provider takes your medical history, does a physical exam, and orders blood tests to check for bleeding or clotting disorders. To prevent this rare complication, a computerized tomography (CT) scan or magnetic resonance imaging (MRI) scan is often performed before a lumbar puncture to look for any sign of a space-occupying lesion resulting in increased intracranial pressure. Increased pressure within the skull due to a brain tumor or other space-occupying lesion can lead to compression of the brainstem after a sample of cerebrospinal fluid is removed. ![]() Bleeding may occur near the puncture site or, rarely, in the epidural space. The pain might radiate down the back of your legs. You may feel pain or tenderness in your lower back after the procedure. Post-lumbar puncture headaches can last from a few hours to a week or more. The headaches are usually present when sitting or standing and resolve after lying down. The headache typically starts several hours up to two days after the procedure and may be accompanied by nausea, vomiting and dizziness. As many as 25% of people who undergo a lumbar puncture develop a headache afterward due to fluid leaking into nearby tissues. Although lumbar puncture (spinal tap) is generally recognized as safe, it does carry some risks.
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