What should we do about Coronary Calcification on Thoracic CT?

Area of Science:

• Radiology
• Cardiology
• Preventive Medicine

Background:

• Coronary artery calcification (CAC) is often incidentally detected on thoracic computed tomography (CT) scans ordered for non-cardiac reasons.
• On electrocardiogram-gated cardiac CT, CAC is a recognized indicator of coronary artery disease (CAD) and predicts future cardiac events.

Purpose of the Study:

• This review synthesizes current evidence and guidelines on reporting CAC identified in non-electrocardiogram-gated thoracic CT scans.
• To evaluate the clinical significance of incidental CAC findings in patients undergoing thoracic CT for non-cardiac indications.

Main Methods:

• Literature review of current evidence and guidelines.
• Analysis of the association between CAC on thoracic CT and cardiovascular outcomes.
• Comparison of CAC assessment on non-gated versus gated CT.

Main Results:

• CAC on routine thoracic CT is linked to increased risk of myocardial infarction and mortality.
• CAC can be reliably assessed on non-gated thoracic CT, comparable to gated CT.
• Guidelines advocate for reporting CAC found on thoracic CT, though radiologist consensus varies.
• Incidental CAC detection can identify individuals with previously unrecognized CAD, potentially leading to risk factor assessment and preventive treatment.

Conclusions:

• Reporting incidental CAC on thoracic CT is supported by guidelines and can facilitate early cardiovascular risk stratification.
• Future research should explore the impact of management changes based on thoracic CT-detected CAC and investigate automated CAC assessment using machine learning.