Find out what an aortic aneurysm is – learn about the causes, symptoms, diagnostic methods, treatment options, and prognosis. Discover effective prevention strategies.
Table of Contents
- What is an aortic aneurysm? Definition and types
- Most common causes of aortic aneurysm
- Aortic aneurysm symptoms – what to look out for?
- Diagnosis of aortic aneurysm – methods and process
- Aortic aneurysm treatment methods – surgery and pharmacotherapy
- Prevention and prognosis in aortic aneurysm
What is an aortic aneurysm? Definition and types
An aortic aneurysm is a serious and often asymptomatic vascular disease, in which there is a pathological, persistent dilatation of the lumen of the aorta—the largest artery in the human body. The aorta carries oxygenated blood from the heart to all organs and tissues, so its damage poses a risk for serious complications, including death. Medically, an aneurysm is defined as an increase in the diameter of the aorta by at least 50% compared to normal size in a specific section. This abnormal dilation usually affects one clearly identified part of the vessel, although it may involve wider areas. The aortic wall, normally very strong and flexible, can weaken due to risk factors such as atherosclerosis, arterial hypertension, or genetic predispositions. As a result, blood pressure puts more stress on weakened sections, causing them to enlarge, and ultimately form an aneurysm. This change can develop silently for a long time, which is why aortic aneurysms are often detected incidentally during routine imaging tests or when investigating other conditions. Aneurysms carry an increased risk of complications, the most serious being rupture. Rupture of the aorta, whether by dissection or perforation, leads to sudden and often fatal internal bleeding. It’s important to emphasize that aneurysms can occur not only in the abdominal aorta but also in the thoracic section—both types differ in risk factors, symptoms, and clinical management.
In clinical practice, several main types of aortic aneurysms are distinguished, depending on their location and morphology. The most common is abdominal aortic aneurysm, accounting for 75–80% of cases, located below the renal arteries. The second most common is thoracic aortic aneurysm, involving the portion of the aorta that passes through the chest. Occasionally, aneurysms may involve both the thoracic and abdominal aorta—these are called thoracoabdominal aneurysms. According to the vessel wall structure, true and false aneurysms are differentiated. A true aneurysm occurs when the dilation involves the entire thickness of the aortic wall, while a false aneurysm (pseudoaneurysm) arises from disruption of the vessel wall and blood leaking into surrounding tissues, forming an external ‘sac’ from connective tissue. Based on shape and morphology, saccular aneurysms (limited, well-demarcated dilatations) and fusiform aneurysms (symmetrical, involving the full circumference of the aorta over a relatively long section) are distinguished. Each type has a different growth dynamic and risk of rupture, crucial for diagnostic and therapeutic strategies. An aortic aneurysm may coexist with other vascular diseases, such as aortic dissection or atherosclerosis, so diagnosis and treatment require an individualized and multidisciplinary medical team approach. Understanding the specifics of aortic aneurysms—both in terms of location, structure, and stage of advancement—is essential not only for risk assessment but also for selecting optimal treatments and effective preventive actions.
Most common causes of aortic aneurysm
An aortic aneurysm is a condition with a complex and multifactorial etiology, but in practice, it results mainly from chronic damage to the vessel wall. The most important factor leading to aortic wall weakening and aneurysm formation is atherosclerosis, responsible for most cases, particularly abdominal aortic aneurysms. Atherosclerosis involves the gradual accumulation of plaque in vessel walls, causing inflammation, disorganization of aorta layers, loss of elastic components, and replacement by scar tissue. Such a weakened aorta becomes prone to stretching and expanding under blood pressure. Other chronic factors damaging the vessel wall include hypertension, which raises intravascular pressure and further strains an already weakened structure, promoting further expansion. Many patients have both risk factors simultaneously, greatly increasing the likelihood of aneurysm formation. Genetic predispositions also play a significant role—studies confirm that aortic aneurysms are more likely in those with a family history, and certain genetic mutations—especially those affecting connective tissue proteins—notably increase the risk (e.g., in Marfan syndrome, Ehlers-Danlos syndrome, or Loeys-Dietz syndrome). Environmental factors such as smoking are also important—tobacco independently damages the vascular endothelium and accelerates atherosclerotic changes; research clearly confirms that smokers are much more susceptible to aneurysm formation and faster aneurysm growth. Degenerative processes that come with age, especially in the elderly, also contribute; aging leads to the natural loss of elastic fibers and decreased production of collagen and elastin, making the aortic wall thinner and more fragile. In some cases, aortic injury occurs as a result of bacterial infections (infectious/mycotic aneurysms), mechanical trauma, or as a complication following surgical or endovascular interventions, although these are rare compared to more common degenerative and atherosclerotic causes.
The above factors combined mean the highest risk groups are men over 60, people with longstanding hypertension, smokers, and patients with chronic kidney failure or hypercholesterolemia. A history of cardiovascular disease and metabolic factors such as type 2 diabetes also increase aortic susceptibility to damage. In recent years, research has highlighted the roles of chronic inflammation and oxidative stress in exacerbating vessel wall damage and promoting aneurysm formation. Certain connective tissue diseases, beyond the aforementioned mutations, may disrupt the balance between structural protein degradation/synthesis, weakening the aortic wall mechanically. Gender cannot be overlooked—men are more frequently affected, but aneurysms in women tend to rupture more rapidly, associated with differences in vessel wall structure and postmenopausal hormonal changes. Pseudoaneurysms are also notable, often resulting from trauma, medical interventions (e.g., vessel punctures), or inflammation, representing a pathogenesis different from typical atherosclerotic-degenerative changes. Clinically, aneurysm diagnosis is often incidental, and patients often have overlapping risk factors, requiring a holistic approach to diagnosis and treatment. Understanding mechanisms leading to aortic wall degeneration allows for better planning of prevention and proper assessment of aneurysm risks and complications, which is key for medical management strategies.
Aortic aneurysm symptoms – what to look out for?
An aortic aneurysm can develop for a long time without any symptoms, which is why it’s often called the “silent killer.” In the early stages, most patients do not experience any discomfort, so an aortic aneurysm is usually detected accidentally during routine imaging for other reasons, such as abdominal ultrasound, CT scan, or MRI. However, as the aneurysm enlarges or presses on nearby structures, symptoms may appear, differing based on location—abdominal aortic aneurysms give different signs than thoracic ones. In people with an abdominal aortic aneurysm, symptoms can include abdominal pain, a sensation of pulsation in the abdomen (especially when lying on the back), pain radiating to the back or lower spine, and sometimes persistent digestive complaints such as nausea, vomiting, a feeling of fullness, or diarrhea due to pressure on adjacent organs. The appearance of a palpable, pulsatile abdominal mass around the navel may also be characteristic. Thoracic aortic aneurysm symptoms are more varied: frequent are pain in the chest or between the shoulder blades, worsening with exertion, cough, or deep breaths. There may also be shortness of breath, hoarseness caused by pressure on the recurrent laryngeal nerve, swallowing difficulties (pressure on the esophagus), chronic cough, or even symptoms from airway compression such as wheezing. Sometimes, arrhythmias or fainting occur, especially if the aneurysm compresses arteries branching from the aorta. The severity of symptoms usually increases with larger aneurysms.
Exceptionally serious is the sudden rupture of an aortic aneurysm or its wall dissection—this leads to massive internal bleeding and presents with sudden, severe symptoms requiring immediate medical attention. The most alarming signs are very intense, tearing pain—in abdominal aortic aneurysm this is usually in the lower abdomen or lumbar region, radiating to the groin or thighs; in thoracic aneurysm, pain is localized in the chest, neck, or back. Shock symptoms accompany this—pallor, cold sweat, low blood pressure, rapid heart rate, dizziness, and loss of consciousness. Acute multiorgan failure due to sudden blood flow loss is also common. There are also training symptoms indicating slow aneurysm growth or chronic complications—persistent back pain, worsening swallowing problems, pressure on airways, chronic hoarseness, abnormal vascular murmurs audible via stethoscope, or the sudden onset of unexplained chronic anemia. People in high-risk groups—men over 60, smokers, patients with hypertension, atherosclerosis, or a family history of aneurysm—should pay special attention to warning symptoms, even if they seem non-specific or resemble complaints typical of gastrointestinal, spinal, or respiratory disorders. Regardless of symptoms, regular screening in risk groups can save lives by enabling early detection of aneurysms, whose symptoms may remain unnoticed for years or be attributed to other diseases.
Diagnosis of aortic aneurysm – methods and process
Diagnosis of an aortic aneurysm is based on advanced, precise imaging techniques that allow accurate assessment of the presence, location, size, and potential complications of the aneurysm. The diagnostic process begins with a detailed medical history and assessment of risk factors. For people in higher-risk groups, such as men over 60, smokers, patients with hypertension or family history, regular screening is recommended. The key, simplest, and often first diagnostic tool is ultrasound (USG), especially for detecting abdominal aortic aneurysms. Ultrasound is non-invasive, fast, well tolerated, and enables accurate measurement of aorta diameter, detection of morphological changes, and rapid risk assessment of rupture. USG is currently a standard screening element, especially in men over 65. For suspected thoracic aortic aneurysm or the need for more detailed visualization, more advanced imaging is necessary, such as contrast-enhanced computed tomography (CT) and magnetic resonance imaging (MRI). CT offers very high resolution, enabling detailed evaluation of aneurysm size, shape, and relation to nearby organs—it is essential for surgical and endovascular procedure planning. MRI, less frequently performed, is recommended especially in patients with contraindications to iodine contrast used in CT or for assessing aneurysms in the aortic arch and descending aorta. Apart from imaging, laboratory tests are important for ruling out other potential causes of symptoms (e.g., inflammation, infections, blood disorders), both before starting treatment and in monitoring therapy. Cardiac function tests, blood pressure monitoring, and overall cardiovascular evaluation are also crucial, especially in those with medical comorbidities.
CT angiography (CTA) also plays an important role—this technique visualizes the vessel lumen and aneurysm location with three-dimensional anatomical reconstruction, key for planning both traditional and percutaneous stent-graft procedures. CTA can also identify arterial branches at risk of ischemia, arteriovenous fistulas, or intraluminal thrombi that increase complication risk. Transesophageal echocardiography (TEE) is useful for ascending or arch aorta aneurysms when standard transthoracic ultrasound is insufficient. This test helps assess aortic wall changes and heart valves, especially when aortic dissection or other complications are suspected. In patients with inherited connective tissue diseases or other vascular anomalies, genetic studies are often included for precise individual risk assessment and implementation of early surveillance programs. The whole diagnostic process should be carried out by an experienced, multidisciplinary team—cardiologists, vascular surgeons, and radiologists—to ensure proper interpretation and selection of treatment strategy. Regular monitoring of aneurysm size and growth with follow-up imaging is essential—especially for small, non-surgical aneurysms. Frequency of visits and imaging depends on individualized risk factors, aneurysm size, comorbidities, and overall health. Due to advances in imaging diagnostics, physicians can now detect aneurysms earlier, improving prognosis and patient safety.
Aortic aneurysm treatment methods – surgery and pharmacotherapy
Treating an aortic aneurysm is a clinical challenge and depends on many factors, such as aneurysm location, size, growth rate, symptoms, and the patient’s overall health. The main therapeutic strategies are conservative (pharmacotherapy, imaging surveillance) and interventional—which includes traditional surgical operations and endovascular techniques. The goal is to minimize the risk of rupture and cardiovascular complications, and improve quality and length of life. The optimal method is chosen individually, depending on the risk/benefit ratio—since many early-stage aneurysms may remain clinically silent and not require immediate intervention. Pharmacotherapy is especially important in patients with higher surgical risk or when the aneurysm hasn’t yet reached a size qualifying for surgery. Antihypertensive drugs—mainly beta-blockers and ACE inhibitors—are used to keep blood pressure low and reduce wall stress. In patients with increased cardiovascular risk, antiplatelet therapy and statins are also recommended—these reduce cholesterol and help stabilize the vessel wall and slow atherosclerosis. The effectiveness of drug treatment and aneurysm progression is regularly checked with imaging—mainly ultrasound and CT—to detect any enlargement. Lifestyle modification is a crucial therapy element—quitting smoking, a healthy diet, weight control, and physical activity (per doctor’s recommendation) can slow aneurysm growth and improve prognosis.
When the aneurysm reaches a threshold size (over 5.5 cm for abdominal and over 6 cm for thoracic aorta) or rapidly expands, or if symptoms arise, surgery is usually considered. Procedures differ based on location and aneurysm features—currently two main techniques are standard: traditional open surgery with access via abdomen or chest and intravascular stent-graft implantation (EVAR for abdominal, TEVAR for thoracic). Open surgery involves removing the aneurysmal aortic segment and replacing it with a synthetic vascular graft—recommended for extensive/complex aneurysms or rupture cases. This operation carries significant complication risk (especially in elderly or comorbid patients) but offers durable aneurysm resolution. A less invasive alternative is modern endovascular treatment, where a special stent-graft is introduced via the femoral artery to seal off the aneurysm from blood flow, reducing rupture risk. EVAR/TEVAR procedures feature lower perioperative risk, shorter hospital stays, and faster recovery—but require ongoing imaging checks for possible endoleaks (leakage around the stent-graft). Method choice depends on aneurysm anatomy, general health, and possible contraindications. In aortic dissection or ruptured aneurysm, surgical intervention must be immediate as any delay dramatically increases mortality. Besides surgery, supportive treatment is key—intensive circulatory monitoring, proper fluid therapy, pain management, and prevention of hemorrhagic or thromboembolic complications. Regardless of method, aortic aneurysm treatment should be managed by an experienced, interdisciplinary team: vascular surgeons, anesthesiologists, radiologists, and cardiologists—allowing individualization and care optimization at each therapy stage.
Prevention and prognosis in aortic aneurysm
Prevention of aortic aneurysm focuses chiefly on eliminating and controlling risk factors for this dangerous vascular condition. The main element is a healthy lifestyle—quitting smoking has the greatest impact on slowing pathological changes, since nicotine and other tobacco substances weaken vessel walls and accelerate atherosclerosis. Controlling blood pressure is also crucial—hypertensive patients are at higher risk, so following medical advice, regular monitoring, and appropriate medications form the basis of prevention. Keeping cholesterol and triglyceride levels normal, implementing a diet rich in vegetables, fruit, fiber, and healthy fats, and limiting saturated fat, refined sugars, and salt directly reduces atherosclerotic plaque formation risk. Prevention also includes physical activity—regular exercise, adjusted to health capacity, improves vascular fitness, increases aorta elasticity, and supports healthy body weight. Individuals with chronic diseases, such as diabetes or kidney disease, should optimize treatment for those conditions, as poor control increases aneurysm risk. Remember the importance of routine screening—especially in people over 60, smokers, or those with a positive family history. Abdominal aorta ultrasound is a widely used, non-invasive tool that detects early aneurysms, allowing for monitoring and complication prevention. In some cases, genetic counseling is advisable, especially for those with known connective tissue syndromes. Comprehensive prevention, incorporating both medical actions and lifestyle modifications, reduces the risk of developing or progressing an aneurysm and minimizes the probability of acute complications.
Prognosis in aortic aneurysm depends on many factors—the key ones are location, size, and growth rate of the aneurysm, overall patient health, and comorbidities. The best outlook pertains to early-detected, small aneurysms that enable regular monitoring and conservative treatment. Patients diagnosed at an advanced stage or during alarming symptoms (pain, sudden neurological deficits) have a much higher risk of complications, such as rupture or dissection, which could rapidly deteriorate health or cause death. Rupture of an abdominal aortic aneurysm is associated with a very high mortality rate—up to 80% of cases end in death before the patient receives specialist care. By contrast, aneurysms treated electively and on time have much better prognosis; both traditional and modern endovascular surgeries allow for long-term survival and minimize complication risks. Maintaining a favorable prognosis requires close cooperation with specialists—regular check-ups, evaluation of aneurysm growth, and adapting therapy to current health. Secondary prevention also plays an important role—patients after aneurysm surgery should follow recommendations for medication, rehabilitation, and daily habits, including activity and diet. Prognosis diminishes in elderly people with multiple cardiovascular diseases, those not following medical advice, or with fast-growing or atypically located aneurysms (e.g., thoracic section with neurological complications). In conclusion, the outlook is best with early diagnosis, and prevention and treatment tailored to individual needs, which requires diligence, engagement, and support from the medical team.
Summary
An aortic aneurysm is a serious condition that may develop silently for a long time, but its consequences can be life-threatening. Knowing the risk factors and the most common symptoms—such as chest or abdominal pain—allows for quick reaction and appropriate diagnosis. Thanks to modern tests, precise identification and optimal treatment are possible—whether conservative or surgical. Prevention and regular medical control are key, especially in high-risk groups. Early diagnosis significantly improves prognosis and recovery chances.
