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- Dec 4, 2003
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i just had a kaplan question about a baby born with a large head; ultrasound reveals hydrocephalus and marked enlargement of the lateral ventricles. it goes on to ask which site the obstruction most likely occurred at. answer choices:
a) aqueduct of sylvius
b) foramen of luschka
c) foramen of magendie
d) subarachnoid space near brainstem
e) subarachnoid space near cerebral hemispheres
and i know that the foramina of monro drain the lateral ventricles into the 3rd ventricle, so i crossed off answers a-c because those drain the 3rd and 4th vent, respectively. i decided to go with e, because that would be closest to the lateral ventricles.
however, the correct answer was aqueduct of sylvius, because it is apparently the most common site of obstruction. but wouldnt this present with enlarged third ventricles, not enlarged lateral? also, what exactly does an obstruction of the subarachnoid space mean?
thanks!!
a) aqueduct of sylvius
b) foramen of luschka
c) foramen of magendie
d) subarachnoid space near brainstem
e) subarachnoid space near cerebral hemispheres
and i know that the foramina of monro drain the lateral ventricles into the 3rd ventricle, so i crossed off answers a-c because those drain the 3rd and 4th vent, respectively. i decided to go with e, because that would be closest to the lateral ventricles.
however, the correct answer was aqueduct of sylvius, because it is apparently the most common site of obstruction. but wouldnt this present with enlarged third ventricles, not enlarged lateral? also, what exactly does an obstruction of the subarachnoid space mean?
thanks!!