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Lobulated poorly enhancing intraventricular lesion in the frontal horn the left lateral ventricle is unchanged, carefully measuring the T1-weighted sequences compared to preceding studies. No intrinsic T1 hyperintensity is detected. This lesion is mildly hyperintense on T2-weighted sequences (FLAIR). Internal flow-voids suspected. No parenchymal lesion is detected. There is few small scattered foci of T2 signal prolongation in subcortical white matter of frontal lobes bilaterally are stable. There is no hydrocephalus or change in ventricular configuration.
CONCLUSION: Stable intraventricular lesion in the left lateral ventricle, compatible with subependymoma.