My advice is limited wihtout looking at the brain scan, so I will try to help you understand the report. Mild brain atrophy may be normal for a man of his age. FOci of increased signal, depending on their appearance may be normal for age also. It sounds like their is a small meningioma (situated in the meninges, the covering of the brain, not the brain itself), a benign brain tumour, that is relatively common as we get older, and unless large and causing problems, is left alone and followed up periodically with MRI. Meningiomas commonly 'enhance' with contrast. It is probably an incidental finding. The reason why an MRI is ordered for tinnitus is to look for an acoustic neuroma - a tumor in the brainstem.