Case contributed by Frank Gaillard
Diagnosis probable


Incidental finding

Patient Data

Age: 55 years

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.

Case Discussion

This lesion has remained unchanged over 5 years of follow-up, and by far the most likely diagnosis is that of a subependymoma. Hopefully, we will never need to find out histologically. 

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