Radiopaedia.org

Left frontal lobe intra-axial lesion is demonstrated that involves cortex as well as subcortical white matter, expanding both, with moderate regional mass effect, compressing the frontal horns of the lateral ventricles and effacing regional sulci. Bowing of the anterior aspect of the falx cerebri approximately 7.5 mm to the right. No hydrocephalus. Scattered within the tumour are small nodular areas of contrast enhancement, particularly at the medial aspect and at the rim, with no discrete mass enhancing mass demonstrated. The rim of the tumour also demonstrates restricted diffusion (ADC 600-800 x 10^-6 mm^2/s). There are areas of susceptibility artefact within and surrounding the tumour, some representing products of blood degradation. A small amount of calcification is probably also present within the lesion. The contrast enhancing components show increased rCBV, again more noticeably at the medial aspect. MRS through the enhancing components also shows increased choline, increased lipid/lactate and slightly reduced NAA. There are also multiple prominent vessels seen traversing the tumour, felt to be sulcal. Surrounding T2 FLAIR hyperintensity in the left frontal lobe. 

Features are those of an oligodendroglioma.