Mass General Hospital
NOVEMBER 2012
ISSUE 50

 
 
Ruptured Coronary Sinus Aneurysm
Ali Karaosmanoglu, MD, Mannudeep Kalra, MD; Sarah Tsiaras, MD; Vishnu Vanaharam, MD; Wilfred Mamuya, MD, PhD; Suhny Abbara, MD

 
  Clinical History
A 36 year old man presented to his primary care physician with exercise intolerance and shortness of breath, and was found to have a heart murmur. A transthoracic echocardiography revealed a question of supracristal ventricular septal defect. A cardiac CTA was requested to further delineate the anatomy and exclude obstructive coronary artery disease.

Findings
CT angiography of the coronary arteries and the ascending aorta demonstrated the presence of an 8 mm defect between the wall of the right sinus of Valsalva and the right ventricle (figures 1,2) resulting in a left to right shunt. A transesophageal echocardiography performed at the day of the surgery confirmed a large abnormal communication between the right sinus of Valsalva and the right ventricle, consistent with a ruptured sinus of Valsalva aneurysm and a small supracristal ventricular septal defect. There was no associated fluid in the pericardial cavity to suggest extra-cardiac rupture.

The ruptured sinus of Valsalva aneurysm and small conal ventricular septal defect were closed surgically without complications.


Figure 1A


Figure 1B


Figure 2A

Figure 2B

(Click on image to enlarge)

Figure 1(A,B): Corresponding gray scale echocardiography (A) and 3 chamber reformatted CTA images demonstrates an abnormal communication between the right coronary sinus and the right ventricle through a defect in the right coronary sinus (arrows in both images). LV: left ventricle, RV: right ventricle, AO: Aorta.

Figure 2(A,B):
Corresponding color Doppler echocardiography (A) and CTA (B) images show the abnormal communication between the right coronary sinus and the right ventricle (white arrows in both images).  Also note the jet flow from the left ventricular outflow tract towards the right ventricle. LV: left ventricle, RV: right ventricle, AO: Aorta.

Discussion
Sinuses of Valsalva are focal expansions of the aortic root and located between the aortic annulus and the sinotubular junction. The coronary arteries originate from the right and left sinuses of Valsalva, with no vessel arising from the non-coronary sinus. These sinuses provide a space behind the valve leaflets when the leaflets are open so that the coronary artery ostia do not get obstructed.

Sinus of Valsalva aneurysms most commonly originate from the right coronary sinus in 70-80% and less commonly from the non coronary (10-20%) and left sinuses (<5%) and may be congenital or acquired. Congenital aneurysms are thought to result from localized weaknesses of the elastic lamina and can be seen in patients with Marfan and Ehlers-Danlos syndrome. Acquired aneurysms can be seen in patients with tuberculosis, syphilis, atherosclerosis, cystic medial necrosis or trauma. The main complications associated with these aneurysms are rupture, arrhythmias, outflow tract obstruction and endocarditis.

Clinical symptoms vary in a wide spectrum from asymptomatic to hemodynamic collapse and sudden cardiac death. Surgical repair is the mainstay of the treatment with excellent survival rates.


 
 
REFERENCES
1. Underwood MJ, El Khoury G, Deronck D, Gilneur D, Dion R. The aortic root: structure, function, and surgical reconstruction. Heart 2000; 83:376380
2. Hoey ETD, Kanagasingam A, Sivananthan MU. Sinus of Valsalva aneurysms: assessment with cardiovascular MRI. Am J Roentgenol;194:495504
3. Bricker AO, Avutu B, Mohammed TL, Williamson EE, Syed IS, Julsrud PR, Schoenhagen P, Kirsch J. Valsalva sinus aneurysms: findings at CT and MR imaging. Radiographics 2010; 30:99-110
   
 

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Editors:
Suhny Abbara, M.D.
MGH Department of Radiology
Wilfred Mamuya, M.D., Ph.D.
MGH Division of Cardiology

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