Lumbar puncture primarily involves which of the following?

Lumbar puncture primarily involves which of the following?

• A. Removal of CSF through the lumbar cistern
• B. Imaging the spinal canal with X-ray
• C. Injecting contrast into the spinal subarachnoid space
• D. Collecting brain tissue via needle

Answer: (A)

Lumbar puncture is about accessing the cerebrospinal fluid in the lower part of the spinal canal. The needle is inserted into the thecal sac in the lumbar region, reaching the lumbar cistern where CSF pools around the cauda equina. The primary goal is to remove CSF for testing (and sometimes to relieve pressure or administer medications intrathecally). This distinguishes it from imaging procedures like X-ray–based spinal imaging, which visualize the spine rather than sample fluid; from procedures that inject contrast for imaging; or from brain tissue biopsy, which retrieves brain tissue. The key idea is sampling CSF from the lumbar subarachnoid space, not imaging or tissue collection.

Lumbar puncture is about accessing the cerebrospinal fluid in the lower part of the spinal canal. The needle is inserted into the thecal sac in the lumbar region, reaching the lumbar cistern where CSF pools around the cauda equina. The primary goal is to remove CSF for testing (and sometimes to relieve pressure or administer medications intrathecally). This distinguishes it from imaging procedures like X-ray–based spinal imaging, which visualize the spine rather than sample fluid; from procedures that inject contrast for imaging; or from brain tissue biopsy, which retrieves brain tissue. The key idea is sampling CSF from the lumbar subarachnoid space, not imaging or tissue collection.