Female, 78 years old, with brain lesion. Preoperative evaluation. A heterogeneous, irregularly marginated rim-enhancing mass is present within the paramedian right frontal lobe. The enhancing lesion extends nearly from the brain surface to the level of the corpus callosum and right lateral ventricular ependyma. The size of the enhancing lesion and the degree of surrounding vasogenic edema appear to have decreased mildly which may reflect the influence of steroids. Nevertheless, substantial mass effect persists with subfalcine herniation and midline shift to the left, effacement of the right lateral ventricle and the left frontal horn, and entrapment of the remainder of the left lateral ventricle. As on the prior examination, the genu of the corpus callosum is abnormally T2 hyperintense and thickened with perhaps a blush of pathologic enhancement. Elsewhere, no definite pathologic enhancement is seen.
Redemonstration of a rim-enhancing tumor in the paramedian right frontal lobe with significant associated edema and mass effect. Since the prior examination, the size of the enhancing lesion and the degree of surrounding edema have slightly improved which may reflect the influence of steroids.