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FIG 1. Case 3. A 57-year-old woman who received epidural anesthesia and underwent MR imaging at 3 days (A–D) and 6 weeks (E and F) after the epidural catheter was removed.
A, Fat-suppressed T2-weighted fast SE image shows a lesion in the posterior epidural space from T12 to L1 (arrow) that is isointense relative to CSF. Lesion has some hypointense areas (arrowheads).
B, On T1-weighted SE images, the lesion (arrow) is relatively hyperintense relative to CSF.
C and D, On sagittal (C) and axial (D) fat-suppressed enhanced T1-weighted images, the lesion (arrow) is homogeneously enhancing.
E and F, T2-weighted fast SE (E) and enhanced T1-weighted (F) images do not show the epidural lesion.
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