Nice one!! Since it is only lateral ventricles being dilated the site of obstruction must be the foramen of Munro. Below,a brief revision of CSF circulation pathway. Thanks and happy new year to everybody!!
CSF CIRCULATION AND DRAINAGE
(fig 1)
From the lateral ventricles CSF passes through the foramen of Munro to the 3rd ventricle(fig 1). From there it passes through the aqueduct of the Sylvius to the 4th ventricle. With the CSF formed by the choroid plexus in the 4th ventricle it exits through the roof of the 4th ventricle. From there it passes along the outer surface of the cerebellum and through the basal cisterns. It passes through the hiatus of the tent to the Sylvian fissures and from there to the para-sagittal area. It is excreted by the arachnoid villi into the venous sinus, mainly the sagittal sinus. It is believed that CSF takes one to two hours to reach the basal cisterns, 3 to 4 hours to reach the sylvian fissure and 10 to 12 hours to spread over the cerebral subarachnoid space. By 24 hours it started to be cleared into the superior sagittal sinus. The mechanism by which the CSF is secreted through the arachnoid villi is still not clear.
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H-DOCTOR
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