PMC8053468_01
Preoperative magnetic resonance imaging (MRI) imaging. MRI of pelvis demonstrating soft tissue mass centered within the right hemigluteal region. Sagittal T2-weighted image (a) and axial T1-weighted postcontrast image (b) is shown with arrowheads indicating location of the mass.
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F1
The lesion extended from the posterior cortex of the second coccygeal segment body to the right gluteal cleft skin. There was no evidence of any intrinsic spinal cord component or definite CSF connection to the central canal [Figure 1].
Myxopapillary ependymoma. The tumor is composed of many papillary structures formed by vessels (arrow) encircled by basophilic myxoid material (asterisk) and collars of cuboidal tumor cells (arrowhead) (a) which demonstrate strong GFAP positivity (b).
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F2
Intraoperative frozen pathology was consistent with myxopapillary ependymoma with negative margins [Figure 2].
Postoperative magnetic resonance imaging (MRI) imaging. MRI of pelvis taken 6 months postoperative demonstrating no evidence of tumor recurrence or metastatic disease to the pelvis. Sagittal T1-weighted postcontrast image (a) and axial T1-weighted postcontrast image (b) shown above.
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F3
At 6 months postoperative follow-up, repeat lumbosacral and pelvic MRIs did not reveal evidence of tumor recurrence or metastatic disease [Figure 3].