Q.All are true regarding intraventricular meningioma except
a. arise from arachnoid cells of the tela choroidea
b. most commonly occur in the lateral ventricles
c. usually appearing in the middle-aged and elderly population
d.have a smooth margin and are generally oval in configuration
e.difffuse hydrocephalus
ANS .—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