A realistic, high-resolution image of a single brain scan, showcasing the intricate details of the human brain's structure. The scan should display the cerebral cortex, lobes, and brainstem, with accurate representation of the brain's anatomy. The colors should be grayscale with subtle gradients to emphasize depth and realism, as seen in an MRI or CT scan. The background should be completely black to ensure the brain scan is the sole focus of the image, with no text or additional elements. The image should convey a clinical, professional appearance suitable for a medical context.