306.All are true regarding
intraventricular meningioma except
a. arise from arachnoid cells
of the tela choroidea / from cell rests within stroma of the choroid plexus
b.
most commonly occur in the lateral
ventricles, particularly in the region of the glomus.
c. usually
appearing in the middle-aged and elderly population
d.have a smooth margin and are generally oval in
configuration
e.difffuse
hydrocephalus
306.---e
Intraventricular meningiomas can usually be differentiated
from choroid plexus papillomas both clinically and with MR. Lateral ventricular
choroid plexus papillomas develop mainly in young children, with meningiomas
usually appearing in the middle-aged and elderly population. Meningiomas have a
smooth margin and are generally oval in configuration whereas papillomas frequently demonstrate
very nodular, heterogeneous, irregular surfaces. Papillomas also usually
present with diffuse hydrocephalus and not just dilation of the trapped
ventricular segment. This occurs either because of their overproduction of CSF
or their frequent bleeding, which may cause obstructing basal arachnoiditis
and/or intraventricular ependymitis. Although papillomas are more frequently
very heterogeneous, intraventricular meningiomas can also show significant
heterogeneity and extensive edema . Therefore, the location of the lesion and the
age of the patient are the two most valuable clues to the diagnosis
No comments:
Post a Comment