Abstract:We report an 8-year-old girl who presented with acute right foot drop with preserved reflex following minor trauma. Brain magnetic resonance imaging showed a large pial arterio-venous malformation (AVM) over the left frontal paramedian convexity with a large varix draining into the superior sagittal sinus. On post-contrast T1-weighted imaging, the AVM showed a swirling pattern with sharply marginated outer hypo-intense area and inner hyper-intense area reminiscent of the Chinese ?yin-yang? symbol. A partially … Show more
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