A man with HIV and low CD4 count has: -Progressive right sidded weakness involing right leg but not arm. -MRI shows mass lesions in white matter of left frontal lobe with bright signal peripherally and dark care (this is another way to say ring enhancing lesion) 1. What is the likely infection causing these findings? 2. In the USA what is the most common way this infection is aqcuired? 3. What is treatment with? 4. In AIDS what is the most common cause for a ring enhancing lesion?

Neurology is the branch of medicine that focuses on the study, diagnosis, and management of conditions affecting the nervous system.