PMC5569398_01
MRI showing intradural mass lesion that is isointense on sagittal T1-weighted (a), hyperintense on sagittal T2-weighted (b) and enhanced after gadolinium injection (c)
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F1
T1-weighted and hyperintense on T2-weighted images; it also markedly enhanced after gadolinium injection [Figure 1]. The patient had a laminectomy for gross total excision of the lesion which proved to be an ependymoma (e.g., grayish tumor resected "en bloc").
Follow-up imaging revealed a flow void lesion in the filum terminale region
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F2
However, 3 months later, the follow-up MR revealed an intradural mass at the L3 level newly accompanied by a signal void [Figure 2].
Intraoperative photograph of the filum terminale artery aneurysm
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F3
During the second surgery, there was no tumor but rather an aneurysm of the distal filum terminale artery [Figure 3].