Rasmussen aneurysm

Rasmussen aneurysm

🩸 Rasmussen Aneurysm — Overview

A Rasmussen aneurysm is a pulmonary artery pseudoaneurysm that arises as a complication of pulmonary tuberculosis (TB), particularly cavitary TB. It represents one of the classic causes of massive or life-threatening hemoptysis in TB patients.

🔬 Pathophysiology

• The inflammatory process from a tuberculous cavity extends into the adjacent pulmonary artery wall.
• This causes destruction of the arterial media and adventitia, leading to focal dilatation or pseudoaneurysm formation.
• The wall of the pseudoaneurysm is composed of inflammatory tissue and granulation, not all three arterial layers — hence a pseudoaneurysm.

🩻 Imaging Findings

1. CT Angiography (CTA):

• The gold standard for diagnosis.
• Shows a contrast-filled outpouching or enhancing focus within or adjacent to a tuberculous cavity.
• Typically located in the upper lobes (where cavitary TB is common).

2. Chest X-ray:

• May show a cavity but rarely demonstrates the aneurysm itself.

⚕️ Clinical Presentation

• Massive hemoptysis — can be sudden and fatal.
• Often in a patient with known pulmonary TB, especially with chronic cavitary disease.
• May be the initial presentation of previously undiagnosed TB in rare cases.

🩺 Differential Diagnosis of Massive Hemoptysis in TB

🧠 Key Distinction

🧩 Management

• Urgent management is essential due to high mortality risk.

1. Airway stabilization and control of bleeding.
2. CT angiography to locate the bleeding site.
3. Endovascular embolization of the affected pulmonary artery branch — treatment of choice.
4. Antitubercular therapy (ATT) for underlying TB.
5. Surgery (lobectomy/segmentectomy) only if embolization fails or not feasible.

💡 Key Takeaways

• Rasmussen aneurysm = Pulmonary artery pseudoaneurysm due to erosion from a tuberculous cavity.
• Massive hemoptysis may be the first clue.
• CT angiography is diagnostic.
• Endovascular embolization is the preferred management.

A Rasmussen aneurysm is an inflammatory pseudoaneurysm—a leak in the artery wall contained by surrounding tissue—that develops on a branch of the pulmonary artery, typically as a rare complication of chronic, cavitary pulmonary tuberculosis. A rupture of this weakened vessel can cause severe, life-threatening internal bleeding. 

Cause

Rasmussen aneurysms form as a result of chronic inflammation, most often from a tuberculous cavity eroding the adjacent pulmonary arterial wall. The inflammation leads to the destruction of the artery’s structural layers, weakening the wall and causing a contained rupture to form. While historically linked exclusively to tuberculosis, the term may now apply to similar aneurysms caused by other destructive lung diseases. 

Symptoms

The most significant symptom of a Rasmussen aneurysm is hemoptysis (coughing up blood), which can range from mild and intermittent to massive and fatal. The massive bleeding from a ruptured aneurysm has a mortality rate as high as 50% if untreated. Other symptoms typically arise from the underlying infection, such as tuberculosis, and may include: 

• Fever
• Cough
• Night sweats
• Shortness of breath
• Weight loss 

Diagnosis

Because of the risk of massive hemorrhage, a timely and accurate diagnosis is critical, especially in patients with a history of tuberculosis. 

• Computed Tomography (CT) Angiography: This is the primary diagnostic imaging tool. It can identify the aneurysm—which appears as a focal dilatation of a pulmonary artery branch—in or near a tuberculous lung cavity.
• Angiography: While more invasive, conventional angiography may be necessary for detailed evaluation, and can be performed concurrently with treatment. 

Treatment

The main goal of treatment is to stop the bleeding and prevent a fatal rupture.

• Endovascular Embolization: The first-line and preferred treatment is a minimally invasive procedure called arterial transcatheter embolization. This procedure uses coils, glue, or other agents to block the blood supply to the aneurysm and stop the bleeding.
• Surgery: Surgical resection may be an option if embolization fails or is not appropriate.
• Anti-tuberculous Therapy: For mild bleeding, treatment of the underlying tuberculosis with anti-tuberculous medications can help resolve the hemoptysis. 

This is for informational purposes only. For medical advice or a diagnosis, consult a professional. AI responses may include mistakes.

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