PMC5820896_01
(a) Magnetic resonance image of the lesion. (b) Magnetic resonance angiography of the lesion revealing a vascular mass lesion. (c) Cerebral angiographic imaging of an arteriovenous malformation in the left parietal region
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F1
She was seen by another physician, and cerebral magnetic resonance imaging (MRI) was performed [Figure 1a]. A vascular malformation at the scalp was considered, and a cerebral MR angiography was performed and revealed a vascular mass lesion, which was located in the left parietal region and supplied by the branches of the left external carotid artery for which venous drainage could not be clearly identified [Figure 1b]. Therefore, we performed a conventional cerebral angiography and detected AVM in the left parietal region that was supplied via the branches of the left temporalis superficial artery, left meningeal media artery, and right temporalis superficialis artery [Figure 1c].
(a) A large number of vessels in narrow stromal edema are monitored. The thick muscular layer of the wall in some of the blood vessels can be identified (H and E, x100). (b) Solid endothelial cell proliferation is present between vessel structures with identifiable lumens (H and E, x400). (c) Immunohistochemically widespread CD34 positivity (QBEnd/10, x100)
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F2
The histopathological diagnosis was as AVM [Figure 2a-c].