CTICasesSkin Fold with Negative Mach Band
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Imaging findings
Two chest radiographs, taken close together, show curvilinear opacities consistent with skin folds. A particularly nice example of a negative Mach band is visible in relation to one of these skin folds.
Key takeaways
This case provides a classic example of a skin fold, specifically illustrating the presence of a negative Mach band. This phenomenon is a valuable distinguishing feature, helping differentiate a benign skin fold from a true pneumothorax, which typically presents with a thin white line and black on either side, rather than a negative Mach band.
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