42-year-old male with new onset seizure. History of left frontal gliosarcoma status post resection. Again seen are extra-axial air and other changes of left frontal craniotomy. There is a low attenuation area in the left frontal lobe, likely representing encephalomalacia and edema. The presence of residual tumor cannot be evaluated on a non-contrast examination. There is mass effect on the left lateral ventricle, not significantly changed from prior MRI.There is no evidence of intracranial hemorrhageThe visualized paranasal sinuses and mastoid air cells are normally pneumatized.
Post surgical changes with low attenuation area in left frontal lobe representing edema/encephalomalacia. The presence of residual tumor cannot be evaluated on a noncontrast examination.