A third ventriculostomy has been performed by a right frontal craniotomy and approach through the right frontal lobe. Surgical tract through the right frontal lobe is surrounded by a tiny amount of blood and there is also a resultant small volume of pneumocephalus. A subtle signal loss demonstrated on high-resolution sagittal FIESTA and flow on phase-contrast flow studies (not shown). Aqueductal web and gross hydrocephalus again shown, ventricular size similar to preop. Resultant thinning of cerebral parenchyma is unchanged from the previous MRI.