Thoracic lumbar puncture
Formal Definition
Thoracic lumbar puncture (or lateral cervical/thoracic puncture, also called cervical puncture at C1-C2) — a variant of the standard lumbar puncture used when the standard approach at L3-L4 or L4-L5 is contraindicated (severe lumbar deformity, surgical fusion, epidural abscess, cellulitis over the lumbar site, or when CSF sampling is required from the basal cisterns) — a C1-C2 lateral puncture between the laminae of C1 and C2 is performed to obtain CSF from the cisterna magna; rarely used in modern practice but remains a recognized technique when LP from below is not feasible.
How It's Used on the Ward
"Thoracic or cervical LP" — reserved for cases where the standard lumbar approach is impossible or unsafe; think of it as an alternative CSF access site; almost always done by interventional neuroradiology or senior neurology under fluoroscopic or CT guidance because of proximity to the upper cervical cord and vertebral artery.
Example
""60-year-old with severe lumbar spinal fusion from L3-S1 (longstanding spinal stenosis with profound neurogenic claudication, fused 4 years prior), presenting with headache concerning for possible meningitis or subarachnoid hemorrhage. Standard LP impossible due to fusion. Neurology consults interventional neuroradiology for C1-C2 lateral cervical puncture under CT guidance to obtain CSF. Procedure: patient lateral, fluoroscopic C1-C2 visualization, needle inserted into the cisterna magna, 4 mL CSF collected. CSF: elevated WBC, low glucose, positive for cryptococcal antigen. Patient diagnosed with cryptococcal meningitis; anti-fungal therapy initiated.""
Clinical Context
Why alternative routes exist: standard LP at L3-L4 or L4-L5 (below the spinal cord termination at L1-L2) is safe because the needle enters the subarachnoid space without touching the cord. When the standard approach is impossible or unsafe (lumbar instrumentation, severe scoliosis, epidural abscess, lumbar cellulitis, prior failed LP attempts), alternative routes include: (1) Lateral cervical puncture at C1-C2 (cisterna magna) — high risk due to vertebral artery and upper cord proximity. (2) Lumbar puncture from a level above instrumentation if no fusion — possible but rare. (3) Lumbar puncture from an interlaminar approach via CT fluoroscopy. (4) Cisternal aspiration via suboccipital route (rare). Who performs these: interventional neuroradiology, anesthesiology sometimes, senior neurology in some institutions. Risks: higher than standard LP — spinal cord injury, vertebral artery injury with stroke or hemorrhage, dural venous plexus injury, post-LP headache (less common at C1-C2). Pre-procedure planning: CT or MRI to assess anatomy, identify surgical hardware, vein/artery positions; informed consent about specific risks. CSF is identical in composition regardless of sampling site unless contamination introduced.