👉 Stenion, also known as a stenosis or narrowing of the middle cerebral artery, is a condition in which the blood supply to the brain is limited. It occurs when there is a blockage or narrowing of the middle cerebral artery, which can cause symptoms such as difficulty understanding speech, visual disturbances, and loss of balance. Stenosis is often associated with other neurological disorders, including Parkinson's disease, stroke, and glioma.