Varied mammographic appearances of invasive lobular carcinoma (ILC). A: Craniocaudal (CC) and mediolateral oblique (MLO) digital mammography (DM) views demonstrate a dense irregular mass with spiculated margins (arrows). B: Mediolateral (ML) oblique DM view, MLO digital breast tomosynthesis (DBT) image, CC synthetic mammogram, and CC DBT image demonstrate architectural distortion without associated mass, better seen in the CC view and on DBT (arrows). C: Mediolateral oblique DM, MLO DBT image, and CC DM demonstrate architectural distortion only seen in the MLO view and best seen on DBT (arrows). D: Bilateral MLO and CC DM views demonstrate a focal asymmetry that is isodense to fibroglandular tissue (arrows). E: Craniocaudal and ML magnification views demonstrate grouped coarse heterogeneous calcifications (arrows). The patient was found to have a 0.2-cm ILC associated with pleomorphic lobular carcinoma in situ. F: Bilateral MLO and CC DM views demonstrate a shrinking left breast that is diffusely denser and smaller in size than the right breast. The left nipple is flattened (arrow). G: Craniocaudal DM view demonstrates a dense, round, circumscribed mass (arrow).