Longitudinal and transverse scan planes can be acceptable for a generalized search of a region and for specifically scanning simple and complex breast cysts. However, demonstrating normal ductal anatomy requires scanning in the radial scan planes because the normal mammary ducts are generally radially oriented away from the nipple. Scanning the breast along the normal anatomic-lobal planes also assists in recognizing the origin and path of a mass which helps to narrow the differential diagnosis.

Longitudinal and transverse: The breast may be surveyed using a back-and-forth motion in each quadrant. These planes are not parallel to the long axis of the underlying lobar anatomy, making it difficult to appreciate masses.  If this survey style is used, the scan plane should be adjusted to radial and antiradial planes as soon as pathology is identified.

Radial and antiradial (The ideal survey pattern): Scanning the breast in an antiradial plane from a peripheral to central minimizes tissue wrinkles, most consistently keeps Cooper’s ligaments under tension, and speeds the examination. All positive findings must be imaged in the radial as well as the antiradial plane.

The most crucial factor is to ensure you've scanned all the tissue in perpendicular planes. If you do not scan perpendicular, you risk missing something, especially something small.

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