Learning to interpret the extracardiac findings on coronary CT angiography examinations

Area of Science:

• Radiology
• Cardiovascular Imaging
• Thoracic Imaging

Background:

• Coronary computed tomography angiography (CTA) is vital for diagnosing coronary artery disease in low- to intermediate-risk patients.
• Coronary CTA datasets inherently include adjacent thoracic structures beyond the heart.
• Extracardiac findings are frequently identified on coronary CTA examinations.

Purpose of the Study:

• To provide an overview and guide for evaluating extracardiac structures visualized on coronary CTA.
• To emphasize the importance of interpreting incidental extracardiac findings.
• To highlight the potential impact of misinterpretation on patient care.

Main Methods:

• Review of coronary CTA data including visualization of thoracic great vessels, pericardium, mediastinum, lungs, and bones.
• Discussion of the need for adjusted CT window display settings for optimal evaluation of soft tissues, lung tissues, and bones.
• Emphasis on comprehensive interpretation beyond cardiac findings.

Main Results:

• The incidence of extracardiac findings on coronary CTA ranges from 53% to 67%.
• Detailed assessment of non-cardiac structures can identify alternative causes for patient symptoms.
• Complete evaluation requires scrutiny of chest and adjacent abdominal soft tissues, lung, and bone structures.

Conclusions:

• Comprehensive interpretation of coronary CTA includes careful evaluation of all visualized extracardiac structures.
• Accurate interpretation of extracardiac findings is critical to avoid unnecessary procedures and ensure appropriate patient management.
• Identifying non-coronary causes of symptoms is essential when cardiac findings are inconclusive.