Male, 55 years old, with brain metastasis versus artifact on recent MRI. History of stage III non-small cell lung cancer status post neoadjuvant chemotherapy with intermittent leg numbness. The previously demonstrated punctate focus of enhancement along the paramedian right superior frontal gyrus is no longer visualized. There is no evidence of T2 hyperintensity or susceptibility at this site. No new pathologic intracranial enhancement is seen. A focus of T2 hyperintensity within the left superior frontal gyrus is unchanged and nonspecific. No edema or mass effect is detected. No evidence of intracranial hemorrhage or any abnormal extra axial fluid collection is seen. Ventricular size and morphology are within normal limits. A mucous retention cyst is present in the right maxillary sinus.
The punctate focus of enhancement seen previously along the right superior frontal gyrus is no longer appreciated on this examination. No additional pathologic enhancement is seen, nor is there any other evidence of intracranial metastasis.