Table 3.

MRI Grading System of Lumbar Spinal Epidural Lipomatosis proposed by Borrè et al. ref. [15]. EF = epidural fat, DuS = dural sac diameter, SC = spinal canal diameter.

SEL MRI Grading System
MRI GRADE	DuS/EF Index	EF/SC Index (%)	Meaning
NORMAL (0)	≥1.5	≤40	Normal amount of EF
GRADE I	1.49–1	41–50	Mild overgrowth of EF
GRADE II	0.99–0.34	51–74	Moderate overgrowth of EF
GRADE III	≤0.33	≥75	Severe overgrowth of EF