Case Prep: Spinal Cord Cavernous Malformation Resection

Case / Approach Snapshot

• Anatomy at risk: cord, roots, dura, posterior elements, segmental and radiculomedullary arteries, venous plexus, and level-specific bony landmarks.
• Operative steps: localize the level, expose while preserving stability, obtain proximal/distal vascular control when relevant, decompress or disconnect/reconstruct the lesion, confirm flow/decompression, and close with CSF-leak prevention; use the detailed operative sequence and approach notes below as the step-by-step source.
• Rescue plans: neuromonitoring change, bleeding from epidural/foraminal vessels, durotomy, wrong-level exposure, cord swelling/ischemia, instability, and staged/endovascular adjuncts.
• Figures: review Figures, Imaging & Video and the Curated Image Set; embedded local figures should remain open-access, public-domain, or otherwise reusable with attribution.
• Papers: review High-Yield Literature for seminal sources, modern reviews, and outcome data specific to this page.

One-Liner

[Age]yo [M/F] with a [cervical/thoracic] intramedullary spinal cord cavernous malformation presenting with [myelopathy / acute deficit from hemorrhage / sensory changes] planned for laminectomy and midline (or dorsal-presenting) myelotomy for microsurgical resection.

Figures, Imaging & Video

🎥 Operative video — search operative video on YouTube ▸ · The Neurosurgical Atlas ▸

🧭 Operative approach: Posterior cervical approach or posterior thoracolumbar approach — posterior myelotomy corridor and closure principles by level.

Neurosurgical Atlas · Radiopaedia · PubMed Central — operative figures © linked; see media-sources.md

High-Yield Literature

• Spinal Cord Cavernous Malformation: A Case Report — Izi Z. Global pediatric health 2023. PubMed
• How I do it: resection of spinal cord cavernous malformation — Agosti E. Acta neurochirurgica 2022. PubMed
• A Rare Instance of Spinal Cord Cavernous Malformation With Adjacent Intramedullary Microhemorrhage — Yu L. The Journal of craniofacial surgery 2024. PubMed
• Clinical features and long-term outcomes of pediatric spinal cord cavernous malformation-a report of 18 cases and literature review — Zhang L. Child’s nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery 2021. PubMed
• C5-C6 Cervical Spinal Cord Cavernous Malformation Microsurgical Resection: 2-Dimensional Operative Video — Enriquez-Marulanda A. Operative neurosurgery (Hagerstown, Md.) 2019. PubMed
• Natural history of hemorrhagic events in spinal cord cavernous malformation: an updated systematic review and Meta-Analysis — Wadhwa A. Neurosurgical review 2026. PubMed
• Acceptance of Early Surgery for Treatment of Spinal Cord Cavernous Malformation in Contemporary Japan — Kurokawa R. Neurospine 2023. PubMed
• Ascending Spinal Cord Infarction Secondary to Recurrent Spinal Cord Cavernous Malformation Hemorrhage — Huntley GD. Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association 2017. PubMed
• Conservative and Surgical Management of Spinal Cord Cavernous Malformations — Ohnishi YI. World neurosurgery: X 2020. PubMed
• Microsurgical resection of symptomatic intramedullary cervical spinal cord cavernous malformation — Dziedzic TA. Neurosurgical focus: Video 2019. PubMed

Curated Image Set

Open-access figures are embedded from PubMed Central articles and kept unique to this guide.

Figure 1. Source: The Reality of Benefit in Surgical Removal for Spinal Cord Cavernous Malformation: Commentary on “Acceptance of Early Surgery for Treatment of Spinal Cord Cavernous Malformation in Contemporary Japan” — Neurospine. 2023 Jun 30;20(2):595–6. doi: 10.14245/ns.2346574.287; CC BY-NC.

Figure 1.. Sagittal (A and B) and axial (C) T2-W spinal MR images shows 2 focal hyperintensity with hypointense edge with surrounding spinal cord edema, this appearance described as « Popcorn ». Source: Spinal Cord Cavernous Malformation: A Case Report — Global Pediatric Health 2023; CC BY-NC.

Figure 2.. Susceptibility-weighted imaging gradient echo (GE) shows hypointense lesions “blooming.” Source: Spinal Cord Cavernous Malformation: A Case Report — Global Pediatric Health 2023; CC BY-NC.

Figure 3.. Sagittal T1-W spinal MR images before (A) and after injection of Gadolinium (B) shows 2 focal hyperintensity with no enhancement (pink arrows), with linear hyperintensity reflect… Source: Spinal Cord Cavernous Malformation: A Case Report — Global Pediatric Health 2023; CC BY-NC.

Figure 5. Source: Spinal Cord Cavernous Malformation: A Case Report — Glob Pediatr Health. 2023 Jul 6;10:2333794X231184317. doi: 10.1177/2333794X231184317; CC BY-NC.

Fig. 1.. Disease duration before presentation to the hospital, stratified by preoperative modified McCormick scale (mMS). Source: Acceptance of Early Surgery for Treatment of Spinal Cord Cavernous Malformation in Contemporary Japan — Neurospine 2023; CC BY-NC.

Fig. 2.. Number of days between the first visit to hospital and surgery, stratified by preoperative modified McCormick scale (mMS). Source: Acceptance of Early Surgery for Treatment of Spinal Cord Cavernous Malformation in Contemporary Japan — Neurospine 2023; CC BY-NC.

Fig. 3.. Time between symptom onset and surgery, stratified by preoperative modified McCormick scale (mMS). Source: Acceptance of Early Surgery for Treatment of Spinal Cord Cavernous Malformation in Contemporary Japan — Neurospine 2023; CC BY-NC.

Fig. 1. MRI demonstrating cavernous malformation in Short Tau Inversion Recovery sagittal and T2 axial views. Source: Spontaneous Hemorrhage of Thoracic Cavernous Malformation Leading to Bilateral Lower Extremity Paralysis — Journal of Community Hospital Internal Medicine Perspectives 2023; CC BY-NC.

Fig. 2. Proportion of included studies reporting demographic variables Source: Reporting practices of baseline and surgical variables in spinal cavernous malformation surgery: a systematic review — Neurosurgical Review 2026; CC BY.

History of Present Illness

• Chief complaint: Stepwise or acute myelopathy/sensory-motor deficits from recurrent micro-hemorrhage
• Number of symptomatic hemorrhages (rebleed risk rises after first), pattern (stepwise decline with partial recovery)
• Familial (multiple lesions, CCM genes), prior radiation

Imaging Review

MRI (T2, GRE/SWI, T1±Gad)

• “Popcorn”/mulberry lesion with hemosiderin rim, blooming on GRE/SWI
• Location within cord, does it reach the pial/ependymal surface? (presenting to surface = safer resection corridor)
• Associated DVA (preserve), syrinx, multiple lesions (familial)
• Non-enhancing (vs tumor)

Surface-Presentation and Entry-Zone Read

• Dorsal midline presentation: safest route is dorsal median sulcus myelotomy, using pial/hemosiderin staining and dorsal vein anatomy to stay midline.
• Dorsolateral presentation: use the lesion’s pial presentation or dorsal root entry zone rather than forcing a midline split across functional dorsal columns.
• Ventral/deep lesion: conservative management or delayed surgery may be safer unless recurrent hemorrhage/progression justifies a higher-risk route.
• Associated DVA: preserve it; cavernoma removal is the goal, not venous obliteration.
• Recent hemorrhage: edema and blood products may help define a gliotic plane but can also make cord swollen and monitoring fragile; timing should balance recovery from acute deficit with rebleed risk and surgical plane clarity.

Labs

• CBC, BMP, Coags, type and screen

Neurological Examination

• Meticulous motor/sensory (dorsal columns, spinothalamic) baseline, reflexes, gait, sphincter

Surgical Planning

Case Logistics, OR Needs & Orders

• OR table/bed: radiolucent spine-capable table selected for approach, imaging, instrumentation, patient size, and alignment goals; keep abdomen free for prone cases.
• OR setup: microscope, neuromonitoring, spinal angiography/DSA images loaded, ICG/Doppler, clips/coagulation tools, laminectomy/instrumentation backup, and blood available for vascular lesions.
• Special needs: arterial line, Foley, MAP support for cord perfusion, no long paralytic with MEPs, CSF drainage plan only when indicated, and coordination with endovascular/staged treatment.
• Immediate postop orders: ICU neuro checks with motor/sensory/sphincter focus, MAP target, MRI/angiography confirmation plan, drain/hematoma watch, steroid/pain regimen, DVT timing, and rehab planning.

Diagnosis & Indication

• Indication: Symptomatic hemorrhage(s), progressive deficit, lesion reaching or near a surface; resect to prevent further hemorrhage
• Conservative if deep, asymptomatic, no surface presentation (surgical morbidity vs natural history)
• Complete resection required (residual → rebleed); preserve associated DVA

Operate vs Observe

The central decision is not “cavernoma equals surgery.” It is whether the natural-history risk now exceeds the morbidity of entering that specific spinal cord surface.

Position

• OR table/bed: radiolucent spine-capable table selected for approach, imaging, instrumentation, patient size, and alignment goals; keep abdomen free for prone cases.
• Prone, Mayfield/foam, IONM baseline (MEP, SSEP, D-wave); per level

Key Surgical Steps

1. Laminectomy over the lesion (navigation/level localization), ultrasound to confirm
2. Midline durotomy, tack-up
3. Identify the safest entry: where the cavernoma presents to the pial surface (hemosiderin staining), or midline myelotomy (dorsal median sulcus) / dorsal root entry zone for lesions not reaching surface
4. Myelotomy, enter the lesion, internally debulk
5. Circumferential dissection in the gliotic/hemosiderin plane, deliver the cavernoma completely
6. Preserve the associated DVA (do NOT coagulate — venous infarction)
7. Hemostasis (gentle), inspect for complete removal
8. Watertight dural closure, sealant

Myelotomy and Resection Nuances

• Confirm level with fluoroscopy/navigation and ultrasound before durotomy; a one-level error in an intramedullary case is catastrophic.
• Open the pia sharply and anchor with fine pial sutures; traction should be on pia/lesion capsule, not normal cord.
• Stay in the hemosiderin/gliotic plane. If normal cord fibers start stretching, stop and re-find the capsule-plane interface.
• Use low-current bipolar sparingly; cavernomas are low-flow lesions, and thermal injury to adjacent tracts is often worse than patient bleeding.
• Remove old clot and mulberry components completely, then inspect the cavity with the microscope angled around all poles.
• Do not chase hemosiderin-stained gliosis as if it were residual cavernoma; the residual risk is lesion tissue, not the stain.

Neuromonitoring Response

• SSEP drop during dorsal column split: pause, irrigate, reduce traction, raise MAP, and narrow the myelotomy.
• MEP/D-wave change: stop resection, raise MAP, reverse any mechanical distortion, remove compressive clot/cottonoid, and wait for recovery before proceeding.
• Stable D-wave with MEP change: may predict recoverable deficit, but still treat it as a warning; do not use it as permission for aggressive traction.
• No reliable baseline: make the corridor and resection more conservative; the anatomy must carry the safety margin.

Critical Anatomy & Structures at Risk

1. Spinal cord tracts — dorsal columns (myelotomy), corticospinal
2. Associated DVA — preserve
3. Anterior spinal artery / perforators (ventral lesions)
4. Dura (CSF leak)

Equipment

• Microscope, ultrasound, micro-instruments, fine bipolar, pial sutures
• Navigation/fluoroscopy, dural substitute, sealant

Monitoring

• SSEPs, MEPs, D-wave, EMG

Anesthesia

• MAP > 85, arterial line, no paralytic (IONM), prone precautions

Potential Complications

1. Neurological worsening — dorsal column (proprioception/sensory, often transient), motor
2. Incomplete resection → rebleed; DVA injury → venous infarction
3. CSF leak, deformity (post-laminectomy)

Rescue Plans

• Cavity bleeding: use gentle irrigation, small cottonoids, patience, and focal bipolar only on lesion remnants; avoid coagulating the DVA or normal cord surface.
• Suspected residual: inspect with angled microscope, ultrasound, and postoperative MRI; if uncertain but monitoring is worsening, stop rather than converting a small residual into a major deficit.
• Cord swelling: loosen retraction, maintain MAP/oxygenation, avoid hypotension, consider steroids per surgeon preference, and close without constrictive grafting.
• Dural closure under tension: graft generously and test with Valsalva; postoperative CSF leak around a spinal cord myelotomy is an avoidable second hit.
• Postoperative decline: urgent MRI for hematoma/residual compression, maintain MAP, reverse coagulopathy, and return to OR for compressive hematoma or tight closure.

Operative Note Template

Preoperative Diagnosis: [Cervical/thoracic] intramedullary spinal cord cavernous malformation [with prior hemorrhage]

Postoperative Diagnosis: Same

Procedure: [Level] laminectomy with myelotomy and microsurgical resection of intramedullary cavernous malformation

Surgeon / Assistant: Anesthesia: Total IV anesthesia, no paralytic EBL / Fluids: Adjuncts: Microscope, ultrasound, pial sutures, fine bipolar; MEP/SSEP/D-wave/EMG; MAP > 85 Implants: Dural substitute, sealant Complications: None

Indications: [Age]yo [M/F] with a symptomatic intramedullary cavernous malformation at [level] after [≥1–2 hemorrhages/progressive deficit] reaching/near a surface. Resection was planned to prevent rebleed. Risks (dorsal-column/motor deficit, DVA injury) discussed.

Description of Procedure: After consent and time-out, TIVA was induced (MAP > 85, no paralytic) and MEP/SSEP/D-wave monitoring established. The patient was positioned prone; a laminectomy was performed over the lesion and ultrasound confirmed localization. A midline durotomy was made and the cord exposed.

The lesion was approached [at its pial presentation / via a midline myelotomy] and entered; it was internally debulked and dissected circumferentially in the gliotic/hemosiderin plane and removed completely. The associated developmental venous anomaly was identified and preserved. Hemostasis was gentle and complete removal confirmed. A watertight dural closure was performed with sealant.

Closure was completed in layers. The patient was transferred with MAP support and CSF-leak precautions; transient dorsal-column dysfunction was anticipated.

Postoperative Plan

• ICU, neuro checks q1h (sensory/motor/proprioception), MAP support, CSF leak precautions
• MRI postop (complete resection), expect possible transient dorsal column dysfunction
• Rehab/PT-OT, DVT prophylaxis (mechanical)
• Familial: genetics, screen neuraxis/brain for other cavernomas; follow-up MRI

Chief-Level Case Review

Use these as the senior-level mental model for Spinal Cord Cavernous Malformation Resection:

• Decision point: The operation is won or lost on control: identify inflow, outflow, perforators, collateral options, and the fastest route to temporary control before exposing the lesion itself.
• Technical lever: Do not accept a cosmetic result over physiology: ICG/Doppler/DSA, branch patency, perforator preservation, and parent-vessel caliber matter more than how the clip or resection bed looks.
• Bailout: Have a rupture or ischemia script ready: lower pressure, suction strategy, temporary occlusion time, heparin/reversal plan, bypass/reconstruction threshold, and postop BP targets.
• Postop watch: Postop danger is delayed: vasospasm, thromboembolism, hyperperfusion, hemorrhage, edema, hydrocephalus, and seizure plans need explicit orders.

Common Pimp Questions

Use these to pressure-test preparation for Spinal Cord Cavernous Malformation Resection:

1. What is the proximal-control plan before the lesion is manipulated?
2. Which branch, perforator, or venous structure is most likely to be injured in this exposure?
3. What are the intraoperative rupture steps, including temporary clip, suction, BP, and backup clip strategy?
4. What confirms treatment success: ICG, Doppler, puncture/deflation, DSA, or postoperative CTA?
5. What postoperative BP, vasospasm, antiplatelet, or anticoagulation issue changes the orders tonight?

Attending Preference Variables

Items that commonly vary by surgeon or institution:

• Preferred approach side, sylvian split style, and cisternal-opening sequence: [attending-specific]
• Temporary clip threshold, burst-suppression preference, and BP during occlusion: [attending-specific]
• Clip manufacturer/shape sequence and whether Doppler, ICG, puncture, or intraop DSA is routine: [attending-specific]
• Antiplatelet/anticoagulation reversal and restart timing: [attending-specific]