FIG 1. Axial conventional MR images.

A, Fast spin-echo T2-weighted axial image (4000/108/2 [TR/TE/excitations]) shows a 3 x 4 x 5-cm hyperintense abscess collection (asterisk) with peripheral hypointensity and surrounding vasogenic edema. Pus-CSF level in the dependent portion of the atrium of the right lateral ventricle is shown (arrow).

B, Contrast-enhanced spin-echo T1-weighted image (550/20/1) shows a mutilocular, cystic, ring-enhancing abscess cavity (asterisk). Rim enhancement along the left lateral ventricular wall (arrows) is consistent with ependymitis.