Ependymoma | Figure 1
CincyKidsRad
Cincinnati Children's Radiology
Ependymoma
Axial head CT at the level of the posterior fossa (image 1) in the lateral ventricles (image 2) show a hypodense mass with calcification (arrow) at midline within the posterior fossa near the fourth ventricle. More superiorly, the lateral ventricles are dilated due to obstruction. Sagittal T1 (image 3), T1 post contrast (image 4), and coronal T2 (Image 5) MRI highlight the heterogeneous posterior fossa mass (arrow). At resection, this was shown to represent an ependymoma. Ependymomas account for 10% of pediatric brain tumors and are more common in children younger than 3 years of age. The majority occur within the posterior fossa.