Figure 1.

A 59-year-old smoker with headache and balance problems. (a) NECT demonstrates a right parietal mass at the gray–white junction with surrounding vasogenic edema. Postcontrast T1-weighted MRI (b) demonstrates ring enhancement, and FLAIR (c) confirms extensive vasogenic edema. (d) DWI demonstrates no restricted diffusion centrally, helping to differentiate this lesion from pyogenic abscess. Needle guided biopsy of a lung mass revealed nonsmall cell lung cancer. The patient underwent stereotactic radiosurgery of the brain mass for presumed lung cancer metastasis