Asymmetrical delayed encephalopathy after acute CO intoxication: a case report.

We report a patient suffering from delayed encephalopathy 21 days after an acute CO intoxication. The initial magnetic resonance (MR) images in the acute stage show a recent infarct corresponding to a right middle cerebral artery (MCA) stenosis. MR images on the 24th day post-intoxication show typical changes of delayed encephalopathy. These changes were much more prominent on the areas corresponding to right MCA territory while less severe on the other parts. The finding suggests an ischemic component contributes to carbon monoxide related delayed brain injury.