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Mach bands and pneumomediastinum
Journal of the Canadian Association of Radiologists
|December 1, 1981
Summary
Radiologists can differentiate Mach bands from pneumomediastinum or pneumopericardium on chest X-rays. Specific criteria help distinguish these findings, even on single postero-anterior views.
Area of Science:
- Radiology
- Medical Imaging
- Thoracic Imaging
Background:
- A thin radiolucent line adjacent to heart borders or aortic knob is common.
- This finding is often a "negative" Mach band.
- It can be misdiagnosed as pneumomediastinum or pneumopericardium.
Purpose of the Study:
- To provide criteria for differentiating Mach bands from pneumomediastinum or pneumopericardium.
- To aid radiologists in accurate diagnosis using single postero-anterior (PA) films.
Main Methods:
- Presentation of specific diagnostic criteria.
- Focus on distinguishing features visible on chest radiography.
Main Results:
- Established criteria allow differentiation without additional imaging.
- The distinction is crucial for avoiding misdiagnosis of air leaks.
Conclusions:
- Radiologists can reliably differentiate Mach bands from pneumomediastinum/pneumopericardium.
- The proposed criteria enhance diagnostic accuracy on PA chest films.