case_images: PMC5569398_01
case_images: 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)
case_images: SNI-8-179-g001.jpg
case_images: PMC5569398_01_SNI-8-179-g001.jpg
case_images: F1
case_images: 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").
case_images: Follow-up imaging revealed a flow void lesion in the filum terminale region
case_images: SNI-8-179-g002.jpg
case_images: PMC5569398_01_SNI-8-179-g002.jpg
case_images: F2
case_images: However, 3 months later, the follow-up MR revealed an intradural mass at the L3 level newly accompanied by a signal void [Figure 2].
case_images: Intraoperative photograph of the filum terminale artery aneurysm
case_images: SNI-8-179-g003.jpg
case_images: PMC5569398_01_SNI-8-179-g003.jpg
case_images: F3
case_images: During the second surgery, there was no tumor but rather an aneurysm of the distal filum terminale artery [Figure 3].