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Subependymoma of filum terminale: MR appearance
M B Roeder1, J R Jinkins, C Bazan
1Neuroradiology Section, University of Texas Health Science Center, San Antonio 78284-7800.
Abstract:
This report describes a subependymoma of the filum terminale evaluated by MRI. The mass demonstrated hyperintense signal on conventional spin echo T1-weighted, proton density, and T2-weighted imaging and nonenhancement after intravenous gadolinium administration. These characteristics distinguish this lesion from other more common neoplastic and inflammatory lesions arising in the lumbar spinal canal that are typically isointense on T1-weighted spin echo acquisitions, hyperintense on T2-weighted imaging, and enhance variably after intravenous gadolinium administration.
Insights
This study details a subependymoma in the filum terminale, identified via MRI. Its distinct imaging signals help differentiate it from other spinal canal masses.
Area of Science:
- Neurology
- Radiology
- Oncology
Background:
- Subependymomas are rare tumors typically found in the central nervous system.
- Filum terminale lesions require accurate diagnostic characterization for appropriate management.
Observation:
- A case of subependymoma in the filum terminale was evaluated using Magnetic Resonance Imaging (MRI).
- The tumor exhibited specific signal intensities on T1-weighted, proton density, and T2-weighted MRI sequences.
Findings:
- The subependymoma demonstrated hyperintense signals on conventional spin echo T1-weighted, proton density, and T2-weighted imaging.
- Crucially, the lesion showed no enhancement following the administration of intravenous gadolinium contrast.
Implications:
- These MRI characteristics are key to distinguishing this specific tumor from other common spinal canal lesions.
- Accurate MRI interpretation aids in differentiating subependymomas from neoplastic and inflammatory conditions in the lumbar region.