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Abstract #3475

Comparison of MRI Features of Infiltrating Lobular Carcinoma with Invasive Ductal Carcinoma Based on ACR BI-RADS MRI Lexicon

Chen J, Su M, Yu H, Baik H, Nalcioglu O
University of California, Irvine, China Medical University Hospital

This study was to analyze and compare the different morphological appearances and kinetic features between ILC and IDC, using the features defined in ACR BI-RADS MRI lexicon. ILC displayed more diverse morphological appearances than IDC. The non-mass-like enhancement patterns were higher in ILC than IDC (7/29 vs. 1/30). Regarding kinetic features, ILC had a higher possibility showing moderate or slow early enhancement phase than IDC (9/35 versus 1/35). While 91% IDC (32/35) demonstrated the typical malignant kinetic pattern with fast early enhancement and wash-out in the delayed phase, this pattern was only seen in 51% ILC (18/35).