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Visual assessment for the presence of a hyperintense FA rim in the immediate zone of edema. The upper panel shows the contrast-enhanced MPRAGE image, FA, and FA with scattered regions of interest representing the enhancing rim of a metastatic brain tumor (from left to right); the lower panel shows the corresponding images from a brain abscess. A hyperintense FA rim is present in the immediate zone of edema surrounding the metastatic tumor (arrow) but absent from that of the abscess.
