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A subtle subacute SAH. (A) Brain CT was done 7 days after the haemorrhage and shows abnormal isointense material in the suprasellar cistern and along the.

Published byAna Luiza de Paiva Modified over 4 years ago

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Presentation on theme: "A subtle subacute SAH. (A) Brain CT was done 7 days after the haemorrhage and shows abnormal isointense material in the suprasellar cistern and along the."— Presentation transcript:

1 A subtle subacute SAH. (A) Brain CT was done 7 days after the haemorrhage and shows abnormal isointense material in the suprasellar cistern and along the path of the left middle cerebral artery towards the sylvian fissure. A subtle subacute SAH. (A) Brain CT was done 7 days after the haemorrhage and shows abnormal isointense material in the suprasellar cistern and along the path of the left middle cerebral artery towards the sylvian fissure. (B) A comparable slice of FLAIR MR imaging done 24 hours after the CT. It shows the abnormality more clearly as high signal material in the left side of the suprasellar cistern and left sylvian fissure (arrows) in keeping with subacute SAH. (C) The same area shows as low signal on T2* MR imaging (arrow). (D) One slice down from C illustrates a problem with the T2* images. The low signal arising from the boundary between tissues of differing susceptibility—in this case the surface of the right lesser sphenoid wing (arrow)—obscures any additional low signal due to blood in the sylvian fissure and could be misinterpreted as blood. This is one reason why we regard the FLAIR and T2* sequences as complementary rather than alternatives. P Mitchell et al. J Neurol Neurosurg Psychiatry 2001;70: ©2001 by BMJ Publishing Group Ltd

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