Which orientation is more typical of a malignant breast mass?

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Multiple Choice

Which orientation is more typical of a malignant breast mass?

In breast ultrasound, the orientation of a mass helps indicate how it behaves. A malignant breast mass more commonly grows across tissue planes, so it ends up taller than it is wide. This "taller than wide" appearance reflects invasion perpendicular to the plane of the breast tissue, rather than expansion within the plane. By contrast, benign lesions—like fibroadenomas—tend to grow within the tissue plane, producing a shape that is wider than tall and often with smooth, well-defined margins. While other shapes can occasionally appear, the height exceeding width is the more suspicious orientation for malignancy.

In breast ultrasound, the orientation of a mass helps indicate how it behaves. A malignant breast mass more commonly grows across tissue planes, so it ends up taller than it is wide. This "taller than wide" appearance reflects invasion perpendicular to the plane of the breast tissue, rather than expansion within the plane.

By contrast, benign lesions—like fibroadenomas—tend to grow within the tissue plane, producing a shape that is wider than tall and often with smooth, well-defined margins. While other shapes can occasionally appear, the height exceeding width is the more suspicious orientation for malignancy.

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