Patients who received breast MRI will be evaluated for a variety of indications including : # each indication : 1) known cancer staging for local exent, 2)high risk, 3)high suspicion clinical finding, 4)questionable mammo finding, 5)silicone leak The number of incidental lesions not detected by any other method that were subsequently subjected to biopsy with the following BIRADS categories 3−# reasons for bx 4−# 5−# Of the lesions detected % of each BIRADS category were postive histologies−ductal, lobular, DCIS, etc. and negative (fibrosis, hyperplasia, etc.) Criteria for classification: morphology, dynamics, clinical significance will be evaluated and a predictive value established.