Charcot-Bouchard Microaneurysm

A Charcot-Bouchard Microaneurysm is a tiny bulge that forms in the small blood vessels of the brain, particularly affecting the tiny arteries deep within the brain tissue. These microaneurysms are most commonly caused by high blood pressure, which weakens the vessel walls over time. When these weakened vessels rupture, they can cause a type of stroke called a hemorrhagic stroke, leading to sudden neurological symptoms like weakness or difficulty speaking. This condition primarily involves the brain's vascular system and can significantly impact brain function due to bleeding. Detecting these microaneurysms is important because they indicate a risk for serious brain bleeding events.

Charcot-Bouchard Microaneurysms are small, fusiform dilations of the penetrating arterioles in the brain, typically less than 300 micrometers in diameter. They arise due to chronic hypertension-induced vascular damage, which causes lipohyalinosis and weakening of the vessel wall. These microaneurysms are most commonly located in the basal ganglia, thalamus, pons, and cerebellum. Their rupture leads to intracerebral hemorrhage, a major cause of hemorrhagic stroke. The presence of these microaneurysms reflects chronic small vessel disease and is a key pathological substrate for spontaneous deep brain hemorrhages. They are distinct from saccular aneurysms, which affect larger vessels and cause subarachnoid hemorrhage.