A 52-year-old woman from Bangalore undergoes MRI brain for progressive cognitive decline and gait disturbance over 6 months. Imaging reveals a 2.5 cm well-demarcated lesion in the right temporal lobe with T2/FLAIR hyperintensity, minimal surrounding edema, and no enhancement on contrast. There is no mass effect. The radiologist suggests a low-grade glioma. The patient is neurologically stable with no seizures. What is the most appropriate next step in management?