Fig. 4

Intracranial tumors. Case 1. Choroid plexus papilloma. Axial T2-weighted fetal MRI (34th week) (a) shows an intraventricular, solid mass in the posterior horn of the right lateral ventricle (white arrow). Postnatal axial T2-weighted image (b) 3 days after birth reveals an increase in the tumor size. Note the extensive paraventricular edema. Case 2. PNET. Sagittal T1-weighted image after i.v contrast medium administration (c) and coronal T2-weighted image (d) in this 6-week-old boy presenting with macrocephaly show the heterogeneous tumor in the posterior fossa (arrow), with both solid and liquid (block arrow) components. The tumor causes a secondary hydrocephalus