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Fig. 1A. —Depiction of perfusion MRI technique for evaluation of cerebral abscesses in 44-year-old man with two confluent rim-enhancing lesions. At biopsy, lesions were shown to be due to Nocardia organisms. Ratio of relative cerebral blood volume (rCBV) in abscess capsule to rCBV in white matter was 0.78. Contrast-enhanced axial T1-weighted image shows two contiguous rim-enhancing masses in right frontal lobe (which appear as single rim-enhancing lesion) that were lesions selected for rCBV analysis in this patient. Another lesion is noted in left temporal lobe.