A stereotactic biopsy is a minimally invasive procedure used to obtain a small sample of tissue from the brain for diagnostic purposes. This technique is highly precise, utilizing advanced imaging technology, such as MRI or CT scans, and a sophisticated computer guidance system to take the surgeon to the exact location of the abnormal tissue. By obtaining a tissue sample, the procedure allows doctors to diagnose various brain conditions, including tumors, inflammation, and other abnormalities, which is crucial for determining the most appropriate treatment plan.