What is chronic lacune? Have chronic lacune is outer skull of 4mm. What could be its impact and how easy or difficult is it to cure?

Lacunar stroke? The term lacuna describes a small infarct or cavity in the brain that develops after resorption of necrotic tissue from an infarcted area a lacuna occurs from arterial insufficiency in the distribution of a penetrating branch of a large cerebral artery. This is not likely to either progress or regress, and if it has not created symptoms yet, will probably not. But risk of future stroke exists.