A mass described as taller-than-wide on ultrasound is most consistent with which diagnosis?

• A. Malignancy
• B. Benign lesion
• C. Cyst
• D. Hematoma

Answer: (A)

In breast ultrasound, the shape of a lesion in the imaging plane matters a lot for risk assessment. When a mass is taller-than-wide, meaning its anteroposterior dimension is greater than its transverse dimension on the image, this orientation suggests growth across tissue planes rather than along them. Malignant tumors tend to invade and extend perpendicularly to the skin, which often results in a height exceeding its width on ultrasound. That pattern is a strong clue pointing toward cancer.

This is why the description of the mass as taller-than-wide fits best with a malignant diagnosis. By contrast, benign lesions such as fibroadenomas typically grow more in a width-wise fashion and have smoother, well-defined margins; simple cysts are usually anechoic with posterior acoustic enhancement and a round or oval shape, not characteristically taller-than-wide; hematomas can vary in appearance and timing but aren’t defined by this specific orientation pattern.