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Multiple Choice

Which statement best describes the imaging appearance of an invasive ductal carcinoma?

Invasive ductal carcinoma tends to grow in a nonparallel fashion to the skin surface, producing a taller-than-wide appearance on ultrasound. This orientation reflects invasion of surrounding tissue rather than expansion along tissue planes. Coupled with irregular or lobulated margins and irregular walls, it signals malignant infiltration rather than a benign process. The other patterns describe benign lesions: a mass that is wider than tall with smooth margins is more typical of benign entities, while round, homogeneous, hypoechoic or small, well-circumscribed lesions with no calcifications fit benign nodules such as fibroadenomas.

Invasive ductal carcinoma tends to grow in a nonparallel fashion to the skin surface, producing a taller-than-wide appearance on ultrasound. This orientation reflects invasion of surrounding tissue rather than expansion along tissue planes. Coupled with irregular or lobulated margins and irregular walls, it signals malignant infiltration rather than a benign process.

The other patterns describe benign lesions: a mass that is wider than tall with smooth margins is more typical of benign entities, while round, homogeneous, hypoechoic or small, well-circumscribed lesions with no calcifications fit benign nodules such as fibroadenomas.