Male, 40 years old, history of anaplastic oligodendroglioma, WHO grade 3, status post RT, TMZ, and Avastin. Findings related to prior right frontal lobe tumor resection are again seen. The large right frontal resection cavity demonstrates no significant interval change in size and morphology. As before, the cavity communicates with the right lateral ventricle.Thick, T2 heterogeneous tissue along the posterior aspect of the resection cavity demonstrates no significant change from the prior examination. This tissue is diffusion restricting, and demonstrates patchy gyriform and speckled intrinsic T1 hyperintensity with little if any superimposed enhancement, also similar to prior.Ill-defined T2 hyperintensity spreading posteriorly from this thickened tissue has improved. Ill-defined T2 hyperintensity along the left frontal horn is unchanged. Left inferior frontal encephalomalacia is unchanged. Volume loss and minimal T2 hyperintensity within the right cerebral peduncle are unchanged. No new parenchymal lesions are seen. The ventricular system is stable in size and morphology.
There has been no significant change in the size or distribution of thickened tissue along the posterior margin of the right frontal resection cavity. As on the prior examination, this tissue demonstrates diffusion restriction, intrinsic T1 hyperintensity and minimal if any enhancement compatible with post-antiangiogenic treatment effect. No new or growing lesions are seen.