If too much of the upper axilla and shoulder are under the compression paddle when imaging for MLO, what is the effect?

When imaging for a medial-lateral oblique (MLO) mammogram, it is vital that the appropriate area of the breast is positioned within the compression paddle. If too much of the upper axilla and shoulder are included under the paddle, it can impede the proper compression of the lower breast. Effective compression is essential for producing high-quality images, as it enhances tissue flattening and reduces motion artifacts, allowing for better visualization of structures within the breast.

When the lower breast is not adequately compressed, the resulting image may have increased tissue thickness, which can obscure details, reduce the visibility of lesions, and contribute to difficulties in interpreting the image accurately. Therefore, ensuring that the right amount of the breast is under the compression paddle is crucial for optimal imaging and diagnostic accuracy.