Male, 63 years old, with visual field defect, status post tumor resection. Evidence of recent resection of the previously demonstrated left occipital lobe tumor is seen. The resection cavity contains air and mixed fluid and blood product as expected.On comparison with the preoperative examination, a majority of the dominant enhancing component of the lesion has been resected. There is, however, enhancement along the posterior margin of the resection cavity extending to the ependymal surface of the atrium and occipital horn which likely represents residual tumor. In addition, there are patchy areas of very ill-defined parenchymal enhancement above the level of the resection which were evident on the preoperative examination and which likely reflect additional sites of tumor.Patchy ill-defined and gyriform T2 hyperintensity is seen within the parenchyma surrounding the resection cavity, similar to the prior examination, which may represent a combination of edema and nonenhancing tumor. Regional mass effect is seen in the form of sulcal and ventricular effacement. However, no significant generalized mass effect or brain herniation is identified. The ventricular system is stable in size and morphology.
Expected findings are seen status post resection of a left occipital lobe tumor. A majority of the dominant enhancing portion has been resected, though there is residual enhancing tumor along the deep aspect of the resection cavity, and in the parenchyma above the resection cavity. There may also be scattered areas of nonenhancing tumor in the surrounding parenchyma as well.