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Epidural Cord Compression: Grading the Bilsky ESCC

Fellowship-level neuroradiology teaching by E. Brooke Schrickel, MD. Open this topic in the interactive reading room →

Watch · concise explainerVisual summary

Core clinical idea

Grade epidural spinal cord compression on the fixed Bilsky 0–3 ESCC scale by reading two planes — epidural fat and CSF around the cord — and translate the grade into urgency; CSF obliterated with cord compression (grade 3) is the emergency that must be named and routed.

Bottom line

Grade epidural cord compression 0–3 on fat and CSF — CSF obliterated (grade 3) is the emergency.

Core workstation questions

  • Is epidural fat preserved (1a), partially obliterated (1b), or gone?
  • Is the thecal sac merely deformed (1c), or is the cord actually contacted (grade 2)?
  • Is CSF still visible around the cord, or obliterated (grade 3)?
  • Have I reported the grade and its urgency, not just a description?

What changes reporting / management

  • Report the Bilsky 0–3 ESCC grade explicitly, defined at the cord and CSF planes.
  • Possible impression: 'Bilsky grade 3 epidural spinal cord compression with CSF effacement and direct cord compression — emergent.'
  • Per the guide key: grades 0–1c cord safe; grades 2–3 cord at risk, monitor closely; grade 3 = true compression / actionable emergency for surgical/radiation-oncology decision-making.

Practical traps

  • Conflating thecal-sac deformity (1c, no cord contact) with cord contact (grade 2).
  • Failing to distinguish CSF still visible (grade 2) from CSF obliterated (grade 3) — the decision hinge.
  • Describing the epidural disease without assigning a grade or its urgency.
  • Expanding the read into a metastatic-disease lecture and losing the clean 0–3 call.

Teaching pearls

  • The grade lives at the cord and the CSF, not at the thecal sac.
  • CSF visible vs. obliterated is the line between at-risk and compressed.
  • Grade 3 is an emergency read — name it and route it.

Teaching visuals

Bilsky / ESCC grading — how much epidural tumour touches the cordAxial · how much epidural tumour touches the cord = the ESCC/Bilsky grade12341 Cordcentral spinal cord2 CSF / thecal sacfluid ring around the cord3 Thecal marginthe dural sac boundary4 Epidural space / bodyanterior — where met disease startsESCC / BILSKY — 6 STEPSmore epidural tumour, 0 -> 3G0G1aG1bG1cG2G3bone onlyno epiduralepidural onlythecal intactthecal deformedno cord touchcord abutmentnot compressedCORD COMPRESSEDCSF still seenCORD COMPRESSEDNO CSFThe clinical hinge — G2 vs G3 (high-grade ESCC)The make-or-break observation is the CSF: at GRADE 2 the cord is compressed but a rim of CSF is still visible aroundit; at GRADE 3 that CSF is effaced — cord compressed with NO CSF. That single step is the surgical decision point.High-grade (G2-3) compression, especially from a radioresistant tumour, favours separation surgery / decompressionBEFORE radiotherapy (NOMS framing). Low-grade (0-1) disease is typically radiation-amenable.
Bilsky ESCC Grading — Axial Canal, Grades 0–3

Source lectures

  • Cord Compression Scale

Educational material for radiology residents and neuroradiology fellows. Nothing here drives individual patient care, and it contains no patient data.