Cerebral embolism accompanied by remarkable diffusion-weighted imaging reversal in a 10 month-old infant with congenital heart disease

•The case of infant ischemic stroke with remarkable DWI reversal.•A mismatch between core volume and visually DWI lesion predicts DWI reversal.•Chronic hypoxia and early recanalization may contribute to large DWI reversal.•Mismatch between DWI-ASPECTS and core volume may occur in infant brain.