PMC9699874_01
(a) Axial T2 magnetic resonance imaging (MRI) weighted image demonstrated a linear and round flow void features of a vascular lesion and an area of parenchymal hypointensity indicating a previous hemorrhage. (b) Sagittal view flair MRI demarcates a cavity and hemosiderin accumulation.
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F1
Brain magnetic resonance imaging (MRI) revealed a right parietal paramedian AVM, bounded posteriorly with the parieto-occipital sulcus, and accompanied by signs of an old hemorrhagic cavity beneath it which extends to the atrium of the right lateral ventricle [Figures 1 and 2].
Artistic depiction of the paramedian arteriovenous malformation (AVM), in this case showing, arterial feeders, the AVM nidus position, venous varix (red arrow), and the draining vein (yellow arrow).
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F2
Brain magnetic resonance imaging (MRI) revealed a right parietal paramedian AVM, bounded posteriorly with the parieto-occipital sulcus, and accompanied by signs of an old hemorrhagic cavity beneath it which extends to the atrium of the right lateral ventricle [Figures 1 and 2].
Serial angiography of the right carotid artery reveals a slow-filling vascular lesion in the parietal lobe. It appears to be fed by the M4 segment of the middle cerebral artery, giving branches to its base. The draining vein appears exceedingly enlarged, forms varix (red arrow), and ends in the superior sagittal sinus.
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F3
The filling of the AVM occurred at the end of the arterial phase, exactly with the beginning of the venous phase [Figure 3], which is not quite typical for an AVM with such a size and location and confirmed to be a slow-filling AVM.