Which imaging modality is best for detecting edema and tissue characterization in suspected myocarditis?

• A. CMR
• B. CT
• C. X-ray
• D. Echocardiography

Answer: (A)

Detecting edema and tissue characterization in suspected myocarditis hinges on imaging that reveals the heart’s tissue properties, not just structure or function. Cardiac MRI provides this directly: T2-weighted imaging and T2 mapping detect increased water content (edema), while gadolinium-enhanced sequences assess necrosis and fibrosis. The pattern of late gadolinium enhancement in myocarditis is typically subepicardial or mid-wall, helping differentiate inflammatory injury from typical ischemic damage. Quantitative mapping (T1/T2) adds objective measures, and the Lake Louise Criteria combine edema, hyperemia, and necrosis/fibrosis for a confident noninvasive diagnosis. Other modalities—CT, X-ray, and echocardiography—focus more on anatomy, coronary arteries, or function and do not provide the same tissue characterization needed to identify edema and inflammatory injury.