Causes of SBI
In this study, the all lesions were small and focal, therefore they were presented as grade A or B lesions. Based on the shape and size of the lesion, the etiology of SBI was interpreted as embolism due to microdebris and air by MRI image reading. Even SBI identified in the watershed region in 13 patients were believed to be caused by emboli because of the shape of the SBI in the watershed region. Knipp and colleague revealed that the cause of SBI after cardiac surgeries was embolism in their study, and the mechanism of embolism involves thromboemboli and air 8,11. Oher researchers revealed that the cause of SBI after catheterization was air that was injected and debris in the ascending aorta 13.