Acquired Supravalvular Aortic Stenosis: Review of a Rare Conundrum with Diverse Etiologies

Abstract

Background

Supravalvular aortic stenosis is a rare form of left ventricular outflow tract obstruction. Classically, supravalvular aortic stenosis occurs secondary to elastin arteriopathy, in association with Williams–Beuren syndrome, or as non-syndromic supravalvular aortic stenosis. In contrast to congenital supravalvular aortic stenosis, acquired supravalvular aortic stenosis refers to supravalvar aortic obstruction resulting from local pathological processes. It is exceedingly rare and occurs secondary to diverse etiologies.

Methods

A comprehensive search was conducted using PubMed and Google Scholar (1950-2024) to identify relevant cases. We also include a case series of four patients with acquired supravalvular aortic stenosis, unrelated to elastin mutations, identified between 2020 and 2025.

Results

Diverse etiologies, including familial hypercholesterolemia, aortic dissection, post-surgical complications, tumor-metastasis-related obstruction, fungal aspergilloma, Takayasu arteritis, and others, have been described to cause acquired supravalvular aortic stenosis in the past. Familial hypercholesterolemia is the most frequently reported cause of acquired supravalvular aortic stenosis. We also describe our experience in managing four cases of acquired supravalvular aortic stenosis.

Conclusions

This series highlights the rarity and diverse etiologies of acquired supravalvular aortic stenosis, emphasizing the need for targeted echocardiographic assessment in at-risk patients.

Keywords

Supravalvular aortic stenosis acquired aortic obstruction left ventricular outflow obstruction aortopathy

Introduction

Supravalvular aortic stenosis is an uncommon anomaly; in fact, it is the rarest form of left ventricular outflow tract obstruction. It is characterized by narrowing at the sinotubular junction, which may often extend into the ascending aorta. Congenital supravalvular aortic stenosis (SVAS) may present in association with Williams–Beuren syndrome or non-syndromically, either through autosomal inheritance or as sporadic cases. The estimated incidence of congenital SVAS is 1:20,000 live births.¹ It arises from a mutation in the elastin gene, leading to an arteriopathy marked by disorganized and reduced elastin fibers within the aortic media, with resultant reduced vessel wall elasticity and concomitant increased shear stress. This, in response, evokes smooth muscle hypertrophy and increased collagen deposition in the ascending aorta.^{2, 3}

In contrast, acquired SVAS is unrelated to elastin mutations and occurs secondary to other identifiable local pathology. Most cases of acquired SVAS are secondary to familial hypercholesterolemia (FH). Other causes are exceptionally rare and include post-surgical complications, infections, or inflammatory conditions.

Methods

A comprehensive search was conducted using PubMed and Google Scholar databases (1950-2024) with search terms “SVAS” OR “supravalvar aortic obstruction” AND “acquired”. Relevant articles were screened for acquired SVAS cases, and data were tabulated for comparison. We have also included four cases of acquired SVAS diagnosed at our institution between 2020 and 2025. These cases were identified through a retrospective electronic medical record review.

Etiology of Acquired Supravalvular Aortic Stenosis

Supravalvular Aortic Stenosis in Familial Hypercholesterolemia

It is an autosomal dominant disorder, usually resulting from mutations in the low-density lipoprotein receptor (LDLR) gene. It is characterized by premature and accelerated atherosclerosis secondary to extremely elevated low-density lipoprotein cholesterol (LDL-C) levels. In homozygous FH (HoFH), LDLR is severely dysfunctional, thereby amplifying these processes and resulting in earlier and more severe manifestations than in heterozygous FH (HeFH). In their systematic review of aortic stenosis (AS) and FH, Bélanger et al. noted that SVAS and valvular AS are relatively common in FH patients.⁴ Autopsy studies have revealed that SVAS in HoFH is secondary to xanthomatous changes characterized by the deposition of atheromatous plaques in the aortic root.^5-7 Additionally, the internal diameter of the supravalvular aortic ridge is smaller in FH patients compared to controls.⁸ Further, it has been observed that FH patients have increased aortic stiffness and reduced distensibility.⁹

Acquired Supravalvular Aortic Stenosis Following Cardiac Surgery

Supravalvular aortic stenosis may occur following surgery on the ascending aorta and aortic root and after aortic graft placement. This occurs through various mechanisms. Most often, it has been observed to be secondary to the formation of a pseudoaneurysm compressing the aortic graft. Suture dehiscence at the site of proximal or distal graft anastomoses, and/or coronary anastomoses may result in blood collecting into the potential space between the native aortic tissue and the graft. This results in pseudoaneurysm formation.¹⁰ With time, the pseudoaneurysm may get partially thrombosed. This complication has been reported as early as the immediate postoperative period, within 1 month of surgery, as well as late, after a few years of surgery.^10-16

Supravalvular aortic stenosis may also develop secondary to the kinking of a redundant aortic graft.^{17, 18}

Other causes of acquired SVAS in the post-cardiac surgery setting include cardiac infections and mediastinitis. The risk of infections increases with the number of invasive procedures, and the likelihood of SVAS increases with multiple aortic punctures. Autopsy studies have revealed that dense fibrosis occurs at the site of previous multiple aortic cannulations and that, following mediastinitis, peri-aortic fibrosis can result in constriction of the supravalvar aorta.¹⁷

In post-heart transplant patients, similar mechanisms can cause aortic graft-related complications, resulting in acquired SVAS.

We describe a child who developed SVAS 4 years after the surgical repair of an aortopulmonary window (Case 2, Annexure 1 available online as supplementary material).

Supravalvular Aortic Stenosis in Type A Aortic Dissection

In type A aortic dissection, hemorrhaging into the false lumen can cause partial luminal occlusion of the ascending aorta, resulting in SVAS.¹⁹

Supravalvular aortic stenosis may also result from the movement of a large, thick intimal dissection flap obstructing the flow in the ascending aorta.²⁰

Inflammation-related Supravalvular Aortic Stenosis

Two cases of idiopathic aortitis-related SVAS have been reported in the literature. The inciting agent for inflammation in these two cases was unclear, with one case probably secondary to a bacterial infection.^{21, 22}

Infection-related Supravalvular Aortic Stenosis

Fungal aortitis, especially caused by Aspergillus species, can result in SVAS through the formation of an aspergilloma or a thrombus in the supravalvar aorta.^{23, 24}

We encountered a case of Kytococcus schroeteri bacterial endocarditis with large vegetations in the proximal ascending aorta, causing SVAS (Case 3, Annexure 1 available online as supplementary material).

Tumor-related Supravalvular Aortic Stenosis

Primary malignant neoplasms of the aortic wall are exceedingly rare, with only a few hundred cases reported in the literature over the past century. Approximately 50% of these tumors occur in the thoracic aorta, with the ascending aorta and aortic root being the least common sites compared to the descending thoracic or abdominal aorta. These may also cause narrowing of the aortic lumen.²⁵

Kim et al. reported a case of bone sarcoma of the tibia, where imaging revealed a huge mass in the ascending aorta and arch. Even after 1 week of anticoagulation, there was no resolution of the mass. Hence, the patient underwent mass excision with the replacement of the ascending aorta and arch. Histopathology of the mass confirmed an undifferentiated pleomorphic sarcoma.²⁶

Supravalvular Aortic Stenosis in Takayasu Arteritis

Takayasu arteritis is a rare large-vessel vasculitis characterized by arterial wall thickening and stenotic/occlusive lesions or aneurysm formation.²⁷ Chung et al. investigated the patterns of aortic involvement in Takayasu arteritis by using computed tomography (CT) angiography. Of the 85 patients evaluated, 31 (36%) and 50 (59%) had aortic root and ascending aorta involvement, respectively. Lesions were characterized by wall thickening or aneurysmal dilatation. Occlusive lesions of the aortic root and ascending aorta were seen in none of their patients.²⁸ Kim et al. reported a case of Takayasu arteritis with isolated SVAS as the initial presentation.²⁹ More typically, it is seen along with more extensive disease, as illustrated (Case 4, Annexure 1 available online as supplementary material).

Transcatheter Intervention-related Supravalvular Aortic Stenosis

An emerging cause of acquired SVAS is aortic root compression during transcatheter pulmonary valve replacement (TPVR). Over recent decades, TPVR has become increasingly popular for addressing residual right ventricular outflow tract (RVOT) lesions in patients with congenital heart disease. During the TPVR procedure, the implanted valve or balloon inflation for valve sizing can compress the aortic root. Lindsay et al. report that 9% of their cases had this complication, and the majority had a native RVOT. They conclude that this potential complication needs to be further studied, especially with the availability of large-sized valves in the market.³⁰

The cases of acquired SVAS found in the literature review are summarized in Table 1 with patient details, key findings, the mechanisms for SVAS, and management. We also describe our experience in managing four cases of acquired SVAS in Annexure 1 available online as supplementary material.

Table 1.

Summary of Relevant Reports on Acquired Supravalvular Aortic Stenosis.

Case Details	Clinical Presentation and Key Findings
Familial Hypercholesterolemia (FH)
16/F, 13/M (1958)⁵	Necropsy of two siblings with familial xanthomatosis revealed supravalvular aortic thickening secondary to xanthomatous plaque deposition in the aorta.
SVAS Post-heart Transplantation (Aortic Graft-related Complication)
43 y/F	Case 1: Mixed connective tissue disease and aortic regurgitation. Three cardiac surgeries: Mechanical aortic valve replacement (AVR); redo AVR and cardiac transplantation subsequently. She expired in the early post-cardiac transplant period. Autopsy findings: Dense fibrosis at the site of previous multiple aortic cannulations, resulting in severe SVAS.
56 y/M, (2002)¹⁷	Case 2: Ischemic heart disease with a past history of coronary arterial bypass graft (CABG) operation. Underwent cardiac transplantation, following which he had Pseudomonas mediastinitis and constrictive pericarditis. Pericardial stripping done. He succumbed to sudden cardiac death 3 years after transplant. Autopsy revealed aortic kinking due to the redundant length of the donor ascending aorta and constriction of the supravalvar region by peri-aortic fibrous tissue.
SVAS Post-replacement of the Ascending Aorta
53 y/M (2008)¹⁸	The patient presented acutely 15 years after the initial surgery. CT revealed SVAS. He underwent redo surgery, which revealed that SVAS had resulted from the kinking of a long aortic graft placed during previous surgery.
56 y/M (1992)¹⁰	Two years after the index surgery, the patient presented with heart failure. Transesophageal echocardiography (TEE) and transthoracic echocardiography (TTE) were suspicious of SVAS. Intraoperatively, a large partially thrombosed pseudoaneurysm was seen hugging the ascending aortic graft. It was concluded that an anastomotic site leak had caused a pseudoaneurysm, which thrombosed partially, resulting in external compression of the graft.
53 y/M (2007)¹¹	Subacute SVAS 1-month post index surgery, diagnosed on TEE. Compression of the aortic graft by a pseudoaneurysm was seen during surgical correction.
38 y/M (1978)¹² 31 y/M (1991)¹⁴ (1973)¹³ 69 y/F (2025)¹⁶	A Marfan’s syndrome patient developed SVAS within a few hours of Bentall’s operation. During re-exploration surgery, hemorrhaging around the graft was seen, which resulted in its compression externally. Similar cases have been reported by Chisholm et al., Crosby et al., and Yoshikai et al., wherein peri-aortic graft hematoma resulting in SVAS occurred in the immediate postoperative period and as well as, as late as 10 years after index surgery.
Type A Aortic Dissection
73/F 65/M (1998)³⁶ 67/M (2008)³⁷	SVAS resulted from the narrowing of the true aortic lumen by external compression from the thrombosed false lumen in the ascending aorta. Diagnosis was made on echocardiography and confirmed by magnetic resonance imaging (MRI). Case 1: Offered surgery, but declined. On follow-up, at 14 months, was doing well. Case 2: Expired from sepsis. A similar case was reported by Sakamoto et al.
67/F (1981)²⁰	Chronic aortic dissection with acute worsening. Cardiac catheterization suggestive of SVAS. Intraoperatively, the dissected intimal flap was found to be large, thick, fibrotic and mobile, causing obstruction by ball valve movement of the flap in the ascending aorta.
Inflammation-related SVAS
65/M (2015) Pergolini et al.²¹	Patient awaiting CABG. Mild SVAS seen on echo. Inflammatory markers negative. Intraoperative findings: Circumferential tissue ridge in the ascending aorta. Diagnosed as idiopathic aortitis. Conservatively managed.
4/F (1968) Moynahan et al.²²	Protracted illness due to dermatitis gangrenosa infantum. Cardiac catheterization suggestive of SVAS. Intraoperative findings: Scleromatous material seen around the aorta. Histopathological examination: Granulomatous deposition causing aortic narrowing. The patient died due to disease progression.
Fungal Infection-related SVAS
60/M (1983) Robbins et al.²³	Patient symptomatic 18 months after CABG. Expired from sudden cardiac arrest. On necropsy, a mass was seen in the ascending aorta, causing SVAS. Histopathological examination confirmed it to be a fungal aspergilloma.
Tumor-related SVAS
73 y/M (2021) Kim et al.²⁶	Patient with bone sarcoma. On echocardiography, a mass was seen within the ascending aorta and arch, causing luminal obstruction and SVAS. Surgical excision done. histopathology-undifferentiated pleomorphic sarcoma.
SVAS in Takayasu Arteritis
32 y/F (2016) Kim and Kim²⁹	Patient was initially diagnosed and treated surgically for SVAS. Histopathologic examination revealed myxoid degeneration and fibrotic changes in the diseased aortic wall. On follow-up CT scan, found to have stenosis of the innominate artery orifice. Hence, the diagnosis was revised as Takayasu arteritis with an atypical presentation.

Note: CT, computed tomography; SVAS, supravalvular aortic stenosis.

Clinical Presentation

Congenital SVAS usually presents in childhood. In contrast, we found that most cases of acquired SVAS, other than FH, occur in adults.³¹ These patients have a highly variable clinical presentation, which depends primarily on the severity of stenosis and the rapidity at which the obstruction has occurred. Patients may present acutely and rapidly deteriorate, especially in the perioperative setting, in view of ongoing hemorrhage as well as the imposition of sudden afterload to the left ventricle. Maintaining a high level of suspicion in cases with a relevant clinical background is very important.

Diagnosis

Prior to the widespread use of echocardiography, cardiac catheterization, and invasive angiography were the primary modalities for diagnosing and quantifying the severity of SVAS. Transthoracic echocardiography with Doppler imaging is valuable for estimating the peak instantaneous and mean pressure gradients across the lesion. However, visualization of the entire ascending aorta can be challenging in adults using transthoracic echocardiography (TTE), particularly when acoustic windows are suboptimal.³ Various scanning windows enable imaging of the proximal ascending aorta, primarily through the left and right parasternal long-axis views, and to a lesser extent, via basal short-axis views. Additionally, the ascending aorta can be visualized in the apical long-axis and modified apical five-chamber views. Modified subcostal views may occasionally aid visualization, more commonly in pediatric patients; although the ascending aorta is typically located at a greater distance from the transducer in this approach.³¹

Transesophageal echocardiography offers superior visualization compared to TTE.^{3, 31} Critical transesophageal echocardiography (TEE) imaging planes include the high transesophageal long-axis and short-axis views.³² Furthermore, a longitudinal view of the aorta can be obtained with the transducer oriented at 90° in the deep transgastric position, allowing comprehensive imaging of the entire ascending aorta and, frequently, the proximal aortic arch.³³ More recently, echocardiography has been complemented by advanced imaging techniques such as magnetic resonance (MR) and CT angiography, which provide detailed and comprehensive visualization of the ascending aorta and aortic arch.^{3, 33}

Management

Although the etiology of SVAS is multifactorial, management is primarily surgical. Even in FH, severe SVAS is typically addressed through aortic root replacement or patch enlargement of the ascending aorta and the root, with or without concomitant valve replacement.³⁴

Currently, there is a lack of specific guidelines and recommendations from major cardiology societies regarding the optimal timing of intervention in SVAS. The European Society of Cardiology (ESC) suggests using thresholds similar to those established for valvular AS.³¹ According to the 2022 Indian Guidelines from the Working Group on Management of Congenital Heart Diseases, surgical intervention is indicated as a Class I recommendation for symptomatic patients with a peak instantaneous gradient ≥64 mmHg and/or a mean gradient ≥50 mmHg on Doppler echocardiography. Additionally, surgery is advised for patients with mean gradients below 50 mmHg if they present with one or more of the following: (a) symptoms attributable to obstruction, such as exertional dyspnea, angina, or syncope; (b) left ventricular systolic dysfunction secondary to obstruction; (c) severe left ventricular hypertrophy related to obstruction; or (d) evidence of myocardial ischemia due to coronary ostial involvement.³⁵

In cases of SVAS related to inflammatory or infectious etiologies, initial management is often medical. However, surgical repair may become necessary depending on the severity of the lesion, the patient’s response to medical therapy, and overall clinical status.

Summary

In contrast to congenital SVAS, acquired SVAS arises in distinct clinical contexts and is being increasingly observed due to advancements in complex cardiac surgery and interventions.

Over the decades, FH has remained the most commonly reported etiology of acquired SVAS. The introduction of statin therapy and lipoprotein apheresis has delayed the onset of AS and shifted the predominant phenotype from SVAS to calcific valvular AS.⁴ However, in resource-constrained settings, FH is often underdiagnosed and undertreated due to limited screening programs, restricted access to genetic testing, and the high cost and limited availability of advanced therapies. This is illustrated by the pediatric FH case presented in our report (Case 1, Annexure 1 available online as supplementary material).

Acquired SVAS after cardiac surgery is an important entity, and maintaining a high level of suspicion in relevant cases, combined with targeted evaluation of the supravalvular aorta during routine follow-up echocardiography, can help detect SVAS at an early stage.

Supravalvular aortic stenosis may also occur in type A aortic dissection, where hemorrhaging into the false lumen causes partial luminal occlusion of the ascending aorta. Other uncommon causes include Takayasu arteritis and tumor metastasis. Focused echocardiographic assessment using suprasternal, right upper parasternal, and subcostal views helps identify and evaluate SVAS.

Conclusion

Acquired SVAS is a heterogeneous condition with diverse etiologies. Patients with acquired SVAS may remain stable for years or even present acutely in a critical state. The rarity of acquired SVAS, along with its variable presentation, contributes to its diagnostic complexity.

Maintaining a high level of suspicion and implementing routine screening for SVAS in at-risk groups—such as patients with FH, and those with prior cardiac surgery, particularly involving the placement of ascending aortic grafts, or individuals undergoing transcatheter interventions near the aortic root—can enable early detection, potentially preventing severe complications. Treatment should be tailored to the underlying cause and the severity of the lesion. Advances in imaging and complex cardiac interventions continue to shape the understanding and management of this rare condition.

Footnotes

Declaration of Conflicting Interests

The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Ethical Approval and Patient Consent

Ethical approval was obtained from the Institutional Review Board. Waiver of consent was obtained in view of the retrospective nature of the study.

Funding

The authors received no financial support for the research, authorship, and/or publication of this article.

Supplementary Material

ORCID iDs

Sandhya S

Gayathri Bhuvaneswaran Kartha

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