FIG 3. Case 3: 19-year-old woman with 3-month history of left-sided radiculopathy and pollakiuria.

A, Left parasagittal T2-weighted (5000/90/2) image shows the ovoid shape of the mass (arrow), which is hyperintense with respect to CSF in the thecal sac. Note the bulging disk at L3–L4 level.

B, Transverse T2-weighted (5000/90/2) image shows a well-demarcated uniformly hyperintense lesion (arrow) without remodeling of the posterior vertebral body.

C, Transverse T1-weighted (802/12/4) image at the superior aspect of L4 shows an extradural mass occupying the left lateral recess (arrow) whose signal intensity is slightly greater than that of the contents of the adjacent dural sac.

D, Contrast-enhanced T1-weighted (802/12/4) image shows no significant changes in the signal intensity of the extradural lesion.

E, Pathologic findings of arteriovenous hemangioma included a large vascular element (asterisk) with thickened wall in association with interstitial hemosiderin deposits (arrow) and hemorrhagic foci (hematoxylin-eosin, original magnification x100).