Infant with increasing head circumference

MRI of choroid plexus papilloma
Axial (above left), coronal (above right) and sagittal (below) T1 MRI with contrast of the brain shows an avidly enhancing round mass that has a frond-like pattern in the third ventricle causing marked dilation of the lateral and third ventricles.

The diagnosis was choroid plexus papilloma.