PMC7251761_01
CT brain on admission (a) and 4 h later with significant increase of swelling (b).
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PMC7251761_01_gr1.jpg
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Of note, the imaging did show chronic opacification of left mastoid air cells and fluid in mastoid air spaces bilaterally (Fig. 1A) CT angiography of the head and neck were subsequently obtained to confirm the suspicion of a left middle cerebral artery thrombus. This rapid, progressive change was markedly abnormal compared to his initial brain CT (Fig. 1B.) The cause of pupillary dilatation was thought to be related to cranial nerve III involvement.