Straightening of left border in mitral stenosis

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Straightening of left border in mitral stenosis, on X-ray chest PA view

Mitral stenosis - straightening of left border on CXR
Mitral stenosis – straightening of left border on CXR

The uppermost portion on the left cardiac border is the aortic knuckle. The next slight bulging is the main pulmonary artery and the left atrial appendage is seen below that. The latter two regions are usually concave and the obliteration of the concavity contributes to the “straightening of left border”. Ao: aorta; MPA: main pulmonary artery; LAA: left atrial appendage