There are new blood products seen along the anterior interhemispheric fissure. No new areas of abnormal parenchymal density. The visualized paranasal sinsues, mastoid air cells and middle ear cavities are clear. IMPRESSION: Alterations in CSF dynamics with interval increase in marked ventricular dilatation and increase in size of pseudomeningocele and right posterior fossa subdural fluid collection. Decreased bilateral holohemispheric and left posterior fossa subdural fluid collections.