Clinical question: Status post ETV. Signs and symptoms: Status post ETV. Nonenhanced head CT:There is evidence of a small right recumbent AP paramedian frontal burr hole since prior study. Small punctate focus of air density immediately under the burr hole is present. Linear low attenuation traversing the right frontal lobe and terminating into the right lateral ventricle likely result of recent instrumentation. Punctate focus of air within the right frontal horn is also present.There is no radiopaque catheter in place.No convincing evidence of any change in size of ventricular system.Periventricular low attenuation of white matter is similar to prior exam corresponding to regions of small muscle ischemic strokes on prior MRI study. Possibility of underlying periventricular exudate of CSF should also be considered.
1.No convincing evidence of interval change in the size of the supratentorial enlarged ventricular system.2.Evidence of interval right frontal burr hole, minimal intracranial air, small linear low-attenuation across the frontal lobe likely along the track of instrumentation.3.No radiopaque ventricular catheter / shunt is present. 