Chest Pain and Blood Pressure Discrepancy: The Hidden Diagnosis on CT

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Adult Coarctation of the Aorta: The CT Diagnosis Hidden Behind Chest Pain and Hypertension

Introduction

A 41-year-old man arrives at the emergency department complaining of persistent chest discomfort.

His electrocardiogram is unremarkable.

Cardiac enzymes are normal.

The initial suspicion of acute coronary syndrome begins to fade.

Then a careful physical examination reveals a critical clue.

The blood pressure measured in the upper extremities is significantly higher than in the lower extremities.

What initially appeared to be a routine chest pain evaluation suddenly becomes a diagnostic challenge.

Subsequent CT angiography reveals a severe narrowing of the thoracic aorta consistent with coarctation of the aorta, a congenital cardiovascular anomaly often diagnosed during infancy but occasionally overlooked until adulthood.

This case highlights one of the most important lessons in cardiovascular imaging:

Not all chest pain originates from the coronary arteries.

Some of the most clinically significant diagnoses lie hidden within the thoracic aorta.

Clinical Background

Coarctation of the aorta (CoA) accounts for approximately 5–8% of congenital heart defects and demonstrates a slight male predominance. The condition results from focal narrowing of the aortic lumen, producing obstruction of systemic blood flow.

While severe infantile forms often present with heart failure and respiratory distress, milder forms may remain undetected for decades.

Adults frequently present with:

  • Hypertension

  • Headaches

  • Exertional chest pain

  • Lower extremity fatigue

  • Claudication

  • Resistant hypertension

  • Incidental imaging findings

The hallmark physical examination finding is a measurable blood pressure discrepancy between upper and lower extremities.

Our patient demonstrated exactly this classical feature, prompting further vascular imaging.

Patient Case Presentation

Patient

  • Age: 41 years

  • Sex: Male

Chief Complaint

  • Chest pain

  • Significant upper versus lower extremity blood pressure difference

Clinical Concern

Potential thoracic vascular abnormality causing systemic hypertension and impaired distal perfusion.

CT angiography was subsequently performed.

CT Imaging Findings

Figure 1

Axial contrast-enhanced arterial phase CT demonstrates focal severe narrowing involving the proximal descending thoracic aorta.


Figure 2

Three-dimensional volume-rendered reconstruction clearly depicts the site of stenosis and its relationship to the aortic arch.


Figure 3

Axial CTA images confirm marked luminal narrowing.


Figure 4

Additional arterial phase images demonstrate:

  • Severe coarctation segment

  • Post-stenotic changes

  • Hemodynamic consequences

  • Collateral vascular pathways

The stenotic segment is located distal to the brachiocephalic artery and proximal to the ductus arteriosus region, corresponding to the infantile/preductal pattern despite adult presentation.

Pathophysiology

The narrowed aortic segment creates a fixed obstruction to blood flow.

This results in:

Proximal Effects

  • Increased afterload

  • Left ventricular hypertrophy

  • Hypertension

  • Elevated upper extremity blood pressure

Distal Effects

  • Reduced lower extremity perfusion

  • Claudication

  • Exercise intolerance

  • Lower extremity hypotension

The body attempts to compensate by developing extensive collateral circulation through:

  • Internal mammary arteries

  • Intercostal arteries

  • Scapular arterial networks

These collateral pathways are frequently visualized on CTA.

Why CT Angiography Is the Gold Standard

Modern multidetector CT provides:

  • High spatial resolution

  • Rapid acquisition

  • Three-dimensional reconstruction

  • Surgical planning capability

  • Stent sizing information

Radiologists can accurately evaluate:

  • Length of stenosis

  • Degree of narrowing

  • Collateral vessels

  • Associated aneurysms

  • Post-stenotic dilation

CTA remains one of the most valuable tools in adult congenital cardiovascular imaging.

Differential Diagnosis

Important differential considerations include:

Interrupted Aortic Arch

Complete discontinuity rather than focal narrowing.

Takayasu Arteritis

Inflammatory vessel wall thickening.

Aortic Dissection

Presence of an intimal flap.

Middle Aortic Syndrome

Diffuse narrowing involving the abdominal aorta.

Severe Atherosclerotic Disease

Older patients with extensive plaque burden.

Careful CT evaluation usually allows a definitive diagnosis.

MRI Findings

Although CT is frequently first-line, MRI provides:

  • Radiation-free evaluation

  • Flow quantification

  • Ventricular function assessment

  • Long-term surveillance

Key MRI sequences include:

  • Contrast-enhanced MRA

  • Phase-contrast imaging

  • Cine SSFP imaging

MRI is especially valuable in younger patients requiring repeated follow-up examinations.

Role of Echocardiography

Echocardiography remains essential because coarctation often coexists with:

  • Bicuspid aortic valve

  • Ventricular septal defects

  • Other congenital anomalies

Doppler interrogation demonstrates elevated flow velocity across the stenotic segment.

AI Applications in Cardiovascular Imaging

Artificial intelligence is transforming cardiovascular imaging.

Computer Vision

Automated vessel segmentation.

Deep Learning

Detection of aortic abnormalities.

Foundation Models

Large-scale image understanding across multiple modalities.

Generative AI

Automated reporting assistance.

Clinical Decision Support Systems

Real-time identification of potentially missed vascular pathology.

Future AI systems integrated into PACS environments may automatically flag:

  • Aortic coarctation

  • Aneurysms

  • Dissections

  • Congenital anomalies

before the radiologist's review.

Clinical Diagnostic Workflow

Treatment Options

Surgical Repair

Traditional approach involving resection and anastomosis.

Balloon Angioplasty

Less invasive option.

Endovascular Stenting

Increasingly preferred in adults.

Advantages include:

  • Shorter hospitalization

  • Reduced recovery time

  • Excellent hemodynamic results

Treatment selection depends upon anatomy, age, and associated abnormalities.

Key Imaging Pearls Every Radiologist Should Know

  1. Always compare arm and leg blood pressures.

  2. Consider CoA in unexplained hypertension.

  3. CTA provides excellent anatomical detail.

  4. Look for collateral circulation.

  5. Evaluate for a bicuspid aortic valve.

  6. Assess post-stenotic dilatation.

  7. Review sagittal reformats carefully.

  8. Use 3D reconstructions for procedural planning.

  9. Exclude associated aneurysms.

  10. AI tools can improve detection rates.

  11. Adult presentation does not exclude congenital disease.

  12. Chest pain may be the first symptom.

Enterprise Imaging and Healthcare Technology

Modern cardiovascular imaging increasingly relies on:

  • Enterprise PACS Solutions

  • Vendor-neutral archives

  • Cloud healthcare infrastructure

  • AI diagnostic software

  • Structured reporting systems

These technologies improve:

  • Workflow efficiency

  • Diagnostic accuracy

  • Population health management

  • Cardiovascular disease screening

Organizations investing in advanced imaging ecosystems are likely to benefit from earlier diagnosis and improved patient outcomes.

Future Perspectives

Over the next decade, cardiovascular imaging is expected to evolve dramatically.

Emerging innovations include:

  • Foundation imaging models

  • Automated CTA interpretation

  • Predictive cardiovascular analytics

  • Personalized risk assessment

  • Digital twins of cardiovascular anatomy

  • Real-time procedural simulation

Radiologists will increasingly function as imaging information specialists supported by AI-driven clinical intelligence platforms.

Conclusion

Adult coarctation of the aorta remains one of the most important congenital cardiovascular disorders that may escape diagnosis until middle age.

In patients presenting with chest pain, resistant hypertension, or upper-to-lower extremity blood pressure discrepancies, CTA plays a pivotal role in establishing the diagnosis.

The presented 41-year-old male case demonstrates how careful clinical assessment combined with advanced cardiovascular imaging can reveal a potentially life-altering diagnosis.

As AI-powered imaging platforms continue to evolve, earlier detection and more precise management of congenital vascular disease are likely to become routine components of modern cardiovascular care.

Key Takeaways

  • Adult coarctation can remain undiagnosed for decades.

  • Blood pressure discrepancy is the most important clinical clue.

  • CTA is the imaging modality of choice.

  • Collateral circulation is a characteristic imaging feature.

  • Endovascular stenting has become a major treatment strategy.

  • AI-assisted cardiovascular imaging is rapidly improving detection accuracy.

  • Radiologists should carefully evaluate the thoracic aorta in every chest CTA.

References

  1. Braverman AC. Coarctation of the Aorta. Circulation. DOI: 10.1161/CIRCULATIONAHA.106.619171

  2. Warnes CA et al. ACC/AHA Guidelines for Adult Congenital Heart Disease. DOI: 10.1161/CIRCULATIONAHA.108.190690

  3. Vohra HA et al. Coarctation of the Aorta in Adults. DOI: 10.1016/j.ejcts.2008.02.020

  4. Forbes TJ et al. Coarctation Stenting Review. DOI: 10.1016/j.jcin.2011.08.011

  5. Quail MA et al. MRI Assessment of Coarctation. DOI: 10.1016/j.jcmg.2011.11.024

  6. Nature Reviews Cardiology – Congenital Aortic Disease Review. DOI: 10.1038/s41569-021-00587-4

  7. Radiology: Artificial Intelligence in Cardiovascular CT. DOI: 10.1148/ryai.220152

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