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FIG 1. A 4-year-old child presented with right ear discharge and brain abscess with intraventricular rupture and meningitis.
T2-weighted axial image (A) through the lateral ventricles shows hyperintensity in the right periventricular region with mass effect. Note the layering in the left lateral ventricle. Corresponding T1-weighted image (B) shows the periventricular lesion as hypointense that displays rim enhancement on post contrast T1-weighted MT image (C). Note the enhancement of the ventricular lining that is more prominent on the right side, which suggests ependymitis (C). DW image (D) and Dav map (E) at the same level show restricted diffusion in the cavity. Note the area of restricted diffusivity in the layered portion of the left lateral ventricle. FA map (F) shows areas of high FA values in the cavity mixed with intervening low FA values. Note the high FA values in the lower part of the left lateral ventricle medial to the optic radiation. Color modulated FA maps fused with Dav map shows (G) orientation in the abscess cavity as well in the left lateral ventricle similar to what is observed in the oriented white matter. Three sections caudally, postcontrast T1-weighted MT image (H) shows the epicenter of the abscess cavity that appears highly oriented on the color-modulated FA maps fused with Dav images. The measured FA values were higher than corpus callusm in some of the regions of the abscess cavity. The color coding is shown (G and I, lower left corner): red (right–left), green (anteroposterior), blue (superior–inferior).
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