|Case 8 :|
reveal an intra-ventricular mass lesion, in the atria of the right lateral
ventricle with intermediate signals on T1 and T2 W images. Curvilinear
areas of signal void are seen, indicating tumoral vessels. Obstructive
hydrocephalus is noted.
plexus papillomas are rare tumors of neuroectodermal origin, representing
0.5 to 0.6% of all intracranial neoplasms. They occur predominantly in the
first decade of life, especially in the first two years. Choroid plexus
papillomas bulge into the ventricular cavity and are therefore primarily
most common site of origin in the pediatric age group is within the atria
of the lateral ventricles, and in adults within the fourth ventricle.
These tumors usually do not invade the brain.
CT scan the typical choroid plexus papilloma appears as a well marginated,
smooth or lobulated iso- or high-density mass protruding into the lumen of
the ventricle with strong contrast enhancement. This marked homogeneous
enhancement is related to the highly vascular nature of the tumor. Tumoral
calcifications are uncommon in the pediatric age group.