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FIG 4. Images from the case of a 70-year-old man with a streptococcus abscess, recent history of acute dizziness, and focal seizures.
A, T2-weighted spin-echo image is consistent with the diagnosis of glioblastoma or necrotic metastasis.
B, Contrast-enhanced T1-weighted spin-echo image is consistent with the diagnosis of glioblastoma or necrotic metastasis.
C, On the diffusion-weighted echo-planar image, however, the "necrotic" area shows high signal intensity (arrow).
D, On the ADC map, very low ADC values (0.29 e-3 mm2/s) are found (arrow). Such behavior was never present in the necrotic parts of gliomas (compare with fig. 3D and E) or metastases and may be highly specific for abscess formation
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