I66: Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction

Occlusion and stenosis of cerebral arteries refer to a group of conditions that involve the narrowing or blockage of the arteries supplying blood to the brain, without leading to a cerebral infarction, or stroke. These issues can occur due to the buildup of fatty deposits or plaques, a blood clot, or other substances that impede blood flow. While the blockage or narrowing does not cause a stroke in these cases, it can still cause significant problems. Symptoms may vary greatly among individuals, but they can include headaches, dizziness, visual disturbances, and cognitive or behavioral changes. These conditions can progressively worsen over time and limit the supply of oxygen and nutrients to the brain, potentially causing damage to the brain cells and affecting various neurological functions. If not managed properly, these conditions may lead to serious complications, including the risk of stroke.