Which of the following most likely causes a communicating (nonobstructive) hydrocephalus?
ATuberculous meningitis
BStenosis of the duct of Sylvius
CBlockage of the arachnoid granulations
DEpendymoma of the fourth ventricle
Arnold Chiari malformation is characterized by all of the following except:
AHerniation of cerebellum
BFlattened base of skull
CSyringomyelia
DHypoplasia of cerebellar vermis
When should folic acid supplementation start in order to be effective in preventing neural tube defects?
AAs soon as pregnancy is diagnosed
BBefore the beginning of 2nd trimester
CAt least one month before conception
DAt least 1 week before conception
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