Aneurysms with a maximum diameter of about 2.0 mm are generally not serious and should be treated according to medical advice and followed up regularly. The risk of an aneurysm is related to the size of the aneurysm and the location of the aneurysm. Cerebral aneurysms, carotid aneurysms, and abdominal aortic aneurysms with a maximum diameter of about 2.0mm have a relatively low risk of rupture and bleeding, and can be treated according to the doctor’s instructions and followed up regularly. However, no matter how small the aneurysm is, there is always a risk of rupture, and therefore it still needs to be taken seriously. An aneurysm is a benign condition that occurs when the wall of an artery protrudes outward. The greatest risk of an aneurysm is that it may rupture and bleed, so the size of the aneurysm should be closely monitored, and prompt medical attention is needed if the aneurysm changes significantly within a short period of time.