Mammographic classification Number of subjects Mean (SD) age Age range Stellate tumor mass 283 65 (12) 36-92 Circular tumor mass 44 67 (14) 42-92 Architectural distortion 52 67 (14) 30-91 Equivocal asymmetric density 49 65 (12) 42-92 Total 428 65 (12) 30-92

Table 1: Mammographic classification and age distribution of 428 invasive lobular carcinoma cases, diagnosed 1996-2010, Falun, Sweden.