Pial arteriovenous fistula
Intracerebral
atypical calcification in nongalenic pial arteriovenous fistula: a case report. Noncontrast computed tomography showing a huge calcified egg-shaped mass. With a small adjacent calcified lesion (A) and a new episode of hemorrhage (B). CT-Angiography of the lesion (C). T1-weighted parasagittal (D) and T2-weighted coronal (E) magnetic resonance images reveal large mass lesion with signal void rim indicative of calcification and central hypersignal intensity due to met-hemoglobin deposition. Post-operative brain CT scan (F).
Intracerebral
atypical calcification in nongalenic pial arteriovenous fistula: a case report. Digital subtraction angiogram: Early arterial phase of the left internal carotid injection revealing an intradural nongalenic arteriovenous fistula supplied from the left MCA and diminished flow in the left ACA due to the high-flow fistula (A). The oblique view of the late arterial phase showing the varix draining into the left lateral sinus (B). Post-operative left internal carotid angiogram revealing the left ACA filling in normal pattern, and the left MCA re-filling to the point that the lesion was previously resected (C and D).
Pial arteriovenous fistulae (pAVF) are rare vascular malformations that usually consist of a single dilated pial artery connecting directly to an enlarged cortical draining vein.
Terminology
pAVFs are distinct from pial arteriovenous malformations because they do not have a nidus and distinct from dural arteriovenous fistula (dAVF) because they arise from a pial artery rather than a dural artery .
Epidemiology
These are rare entities accounting for 1.6% of all intracranial vascular malformations .
Radiographic features
Unlike dAVFs, 80% of pAVFs are supratentorial and typically lie adjacent to the ventricular ependyma or just beneath the brain surface.
Siehe auch:
Assoziationen und Differentialdiagnosen zu Pial arteriovenous fistula:
intrakranielle
vaskuläre Malformationen