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. 2026 Apr 10;13:1792192. doi: 10.3389/fvets.2026.1792192

Figure 2.

Multi-panel figure showing MRI images and surgical findings from the lower spine. Panel A (sagittal MRI view) shows a large, well-defined fluid-filled lesion located dorsally within the vertebral canal at the L6 level, in contact with the end of the dural sac and the filum terminale. A second small fluid-filled structure is visible within the dural sac. Panels B (transverse view) and C (dorsal view) confirm the dorsal position of the lesion, its slight leftward shift, and its relationship with surrounding structures. Panel D (intraoperative photograph) shows the lesion adjacent to the dural sac and a fibrous attachment, supporting restricted movement.

Multiplanar magnetic resonance images consisting of sagittal T2-weighted (A), transverse T1-weighted (B), transverse T2-weighted (C), transverse post-contrast T1-weighted (D), and dorsal STIR (E) sequences. A well-defined, teardrop-shaped, extradural cyst-like structure is present at the level of L6 (yellow arrows), positioned dorsally within the vertebral canal and in direct contact with the termination of the dural sac and the origin of the filum terminale externum, resulting in mild ventral displacement of the latter. The lesion is isointense to CSF, appearing hyperintense on T2-weighted (A, C) and STIR (E) sequences, hypointense on T1-weighted images (B), and showing no contrast enhancement (D), features consistent with a CSF-filled meningeal diverticulum. Additional findings include mild, symmetric enhancement of the dorsal sacrocaudal muscles compatible with denervation (green arrows, D), dorsal sacral laminar telescoping (blue arrowhead, A), a transitional S1 vertebra, and caudal vertebral dysgenesis (dotted red circle, A).