Abstract
✓ Obstruction of both Torkildsen and ventriculoatrial shunts by positive contrast medium injected at a previous ventriculography is reported. This complication was surgically confirmed and alleviated. Two similar cases with ventriculoatrial shunts obstructed by Pantopaque are briefly described. All cases presented symptoms of increased intracranial pressure until the contrast medium was eliminated. In cases requiring Pantopaque ventriculography, central ventriculography often permits removal of the opaque medium at the end of the examination, avoiding this complication if shunting is performed later.
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