Tumour features: comparative proportions of tumour features are presented for invasive lobular carcinoma (ILC) and invasive ductal carcinoma (IDC) on digital mammography (DM) (a) and digital breast tomosynthesis (DBT) (b). On DBT, compared with IDC, ILC presented less frequently as masses (p = 0.01) and demonstrated a higher proportion of distortion, although this difference did not reach statistical significance (p = 0.1). On DM, ILC presented more often as asymmetries than masses (p = 0.02), whereas on DBT ILC presented a comparable proportion of masses and asymmetries (p = 1.00).