Fibrolipoma of the Filum Terminale

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Lumbar filum terminale fibrolipoma - T1 MRIBy Chris Faubel, M.D. —

A lipoma or fibrolipoma of the filum terminale is a somewhat uncommon (4-6%) and usually incidental, asymptomatic finding on MRIs of the lumbar spine.

Imaging

Best visualized on sagittal T1-weighted MRIs

T1-weighted MRI = hyperintense

T2-weighted MRI = hyperintense (though not nearly as obvious)

Clinical Significance

Typically asymptomatic

Can sometimes be associated with a low-lying and thickened conus in cases with clinical findings consistent with tethered cord syndrome.

Lumbar filum terminale fibrolipoma - T1 and T2 MRI

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