Meningoencephalitis with Streptococcus equi Subspecies equi Leading to a Dural Arteriovenous Fistula

Figure 2

During readmission five months after the initial referral, consecutive CT scans showed multiple right-sided cerebral haemorrhages, the largest being located precentrally in the frontal lobe ((a), para-axial nonenhanced). CT angiography examination ((b), para-axial MPR) showed multiple tortuous, engorged pial veins of the right hemisphere. Cerebral angiography confirmed the presence of a suspected superficial dural arteriovenous fistula ((c), lateral projection of right internal carotid artery injection, large black arrow) in the right parietal region. The arterial feeders were mainly meningeal branches originating from the right ophthalmic artery and transosseous feeders from the right superficial temporal and occipital arteries ((d), lateral projection right external carotid artery injection); in addition, there was limited arterial supply to the fistula from the left middle meningeal artery, across the midline (not shown). Venous drainage was through a large, right temporal draining vein (large white arrow), with reflux into multiple tortuous, superficial frontotemporal veins, as shown in Figure 2(b), indicating a fistula with a high risk of haemorrhage. Comparison of axial T2-weighted images of MRI examinations at initial admittance (e) and at the second admission (f) showed the new finding of dilated pial veins (encircled), demonstrating the de novo development of the dural AV fistula.

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