The Challenge of Incidental Pulmonary Embolism Diagnosis

Incidental pulmonary embolism (iPE) is frequently encountered in clinical practice, appearing in approximately 1% of non-dedicated thoracic CT examinations. Managing these findings is often difficult because initial reports may lack diagnostic certainty. Consequently, clinicians frequently order dedicated CT pulmonary angiography (CTPA) to confirm the presence of a clot. However, recent research suggests that a formal expert review might be a more efficient alternative for incidental pulmonary embolism diagnosis.

Impact of Expert Review on Imaging Frequency

In a retrospective study of over 25,000 CT scans, only 48% of patients who underwent follow-up CTPA actually had a confirmed pulmonary embolism. This discrepancy highlights a high rate of false-positive reports in non-dedicated studies. Furthermore, the study demonstrated that retrospective expert review by subspecialist radiologists showed excellent agreement with CTPA results (Kappa = 0.94). Therefore, utilizing expert consultation can significantly improve the accuracy of an incidental pulmonary embolism diagnosis. This approach potentially prevents up to 43% of unnecessary follow-up imaging. Consequently, this strategy reduces patient radiation exposure and healthcare costs.

Clinical Implications for Radiologists and Physicians

For clinicians in India, where resource optimization is vital, these findings advocate for a multidisciplinary approach. Instead of immediately proceeding to CTPA, hospitals should consider implementing an internal review process. Specifically, when the initial diagnostic certainty is low, a second opinion from a senior radiologist can clarify the situation. This strategy ensures that only patients with a high likelihood of true PE receive further invasive or contrast-heavy investigations. Moreover, this refinement in workflow enhances overall patient safety.

Frequently Asked Questions

What is the prevalence of incidental pulmonary embolism in routine CT scans?

Research indicates that incidental PE is found in approximately 1% of all contrast-enhanced thoracic CT scans not specifically designed for PE protocols.

Can expert review replace follow-up CTPA?

Yes, expert review has shown a 94% agreement rate with CTPA findings. It can effectively confirm or exclude a diagnosis, potentially reducing unnecessary follow-up scans by 43%.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a professional relationship. Always seek the advice of a qualified healthcare provider for any questions regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.

References

1. Kidson CRT et al. Incidental pulmonary embolism and the value of CT pulmonary angiography follow-up versus expert review. Br J Radiol. 2026 Jun 05. doi: undefined. PMID: 42249711.


2. Chiu V, O'Connell C. Management of the Incidental Pulmonary Embolism. AJR Am J Roentgenol. 2017;208(3):485-488.


3. den Exter PL, et al. Reliability of diagnosing incidental pulmonary embolism in cancer patients. Thromb Res. 2015;136(3):531-4.