PMC6417311_01
Sagittal magnetic resonance imaging of the lumbar spine showing an intradural tumor, isointense on T1-weighted images with peripheral contrast enhancement (a) and hypo-intense on T2-weighted images (b)
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F1
The magnetic resonance imaging (MRI) was performed as soon as possible, revealing an intradural extramedullary lesion at the L2 and upper of L3 levels [Figure 1].
Intraoperative picture: The tumor is intradural, reddish and covered by the cauda equina roots
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F2
The tumor was located deep in the cauda equina roots [Figure 2].
Encapsulated oval-shaped tumor (a). Tumor proliferation arranged in anastomosed trabecular structures, surrounded by a thin capsule (b: H and E, x4, c: H and E x10). polygonal cells with round nuclei and granular cytoplasm, gathered in clusters: The Zellballen pattern (d: H and E, x40). Mitotic figures are rare. The tumoral stroma's type is endocrine with a capillary network. Some hemorrhage foci are noticed. Immunohistochemical staining showed the expression of synaptophysin by tumor cells (e) and positivity of S100 protein in sustentacular cells (f)
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F3
The pathological studies concluded to a PGL [Figure 3].