How would an invasive ductal carcinoma mass typically appear?

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The main idea is that malignant breast masses, like invasive ductal carcinoma, tend to grow across tissue planes and invade surrounding tissue, which shows up on ultrasound as a tall (AP) dimension that’s greater than the width. This vertical orientation is paired with irregular, sometimes lobulated, margins rather than smooth, well-defined borders. That combination—taller-than-wide with irregular walls and lobulations—signals invasive growth and higher suspicion.

Benign lesions, by contrast, more commonly appear round or oval with a width greater than the height and have smooth, well-circumscribed margins. The other descriptors in the options—round with smooth margins and well-circumscribed shapes, or small, well-defined lesions with no calcifications—fit benign patterns or mammography-detected calcifications rather than IDC.