British Society of Breast Radiology Annual Scientific Meeting 2016

31.12.13).Chi squared analysis was used to compare the rate between the two groups and the rate of false negative (FN) and minimal signs (MS) categories considered together. ResultsOf 87,868 screened before digital between 1.1.10and 31.12.11,103 developed IC (0.12%) and of 100,672 screened with digital between 1.1.12and 31.12.13,145 developed IC (0.14%) (p = 0.12).Those women with FN and MS interval cancer numbered 17 (16.5%)predigital and 41 (28.3%) with digital; (p = 0.04).The number of true IC was similar in the pre (49.5%) and post (46.9%) groups. ConclusionThe rate if IC is similar to the NHSBSP standard (1.2 per 1000 women screened).Despite earlier groups indicating that digital technology will lessen the number of IC, especially those 'missed' (FN and MS groups) which are often asymmetric densities and poorly defined masses, this has not been found in our study.The reasons for this will be discussed and examples will be shown.