How does a malignant process affect the integrity of tissue planes in breast imaging?

• A. Potential to invade other tissues by crossing fibrous planes
• B. It does not cross planes
• C. It only affects superficial tissue
• D. It distorts Cooper's ligaments

Answer: (A)

Malignant tumors spread by invading into adjacent tissues, not staying confined to a single tissue plane. They can cross fibrous planes and septa, including structures like Cooper’s ligaments, which leads to invasion beyond the original confines and causes architectural distortion on imaging. This infiltrative behavior is a hallmark of cancer and explains why malignant processes disrupt tissue boundaries rather than respecting them.

In contrast, a statement that a lesion does not cross planes underestimates cancer’s invasive nature, and claiming it only affects superficial tissue ignores deeper extension. Distorting Cooper’s ligaments can occur as a result of invasion, but the key concept is the ability to cross tissue planes and invade surrounding tissues.