Why is the MLO projection preferred over the ML projection for routine imaging?

The MLO projection is preferred over the ML projection primarily because it provides better visualization of the posterior and lateral aspects of the breast. In the MLO position, the breast is compressed in a way that allows for better access to the larger volume of breast tissue, including the areas that are often missed with the ML projection.

By angling the X-ray beam during the MLO projection, more of the breast tissue is included in the image. This is particularly important for detecting lesions that may be located toward the back or sides of the breast, as these areas are more difficult to visualize with the ML projection due to the positioning of the breast. Additionally, the MLO projection helps to reduce superimposition of breast tissue, enhancing the overall quality of the mammogram and increasing the likelihood of accurately detecting abnormalities.

While the other options touch on valid points regarding patient comfort and aspects of breast tissue visualization, the primary reason the MLO projection is preferred in routine imaging is its effectiveness in capturing the full anatomy of the breast, including areas that may be obscured in other projections.