In inhalation injury management, which imaging modality is most sensitive for detecting edema?

• A. Chest X-ray
• B. Ultrasound
• C. Positron emission tomography
• D. Chest CT

Answer: (D)

Inhalation injury edema is best picked up with chest CT because of its high-resolution, cross-sectional imaging that can reveal subtle changes in the lung interstitium and airways. CT can detect early interstitial edema as ground-glass opacities and compare patterns of edema throughout the lungs, as well as airway wall thickening and edema that often accompany inhalation injury. These findings may be invisible on a chest X-ray in the early stages, so X-ray can underestimate or miss edema altogether.

Ultrasound has value for detecting certain fluid issues and can show edema indirectly via B-lines, but it’s limited by acoustic windows and cannot reliably assess central lung regions or airway edema. PET is focused on metabolic activity and inflammation in a way that’s not directly useful for identifying edema, and it isn’t practical for acute edema assessment. Chest CT, with its detailed, whole-lung visualization, provides the most sensitive assessment for edema in this context, guiding timely and appropriate management.