Synopsis

This talk first explains the definition of non-mass enhancement (NME), as an area that is neither a mass nor a focus. Internal enhancing characteristics of NME are discrete from the normal surrounding background parenchymal enhancement. NME is described in terms of “distribution” and “internal enhancement patterns”. Linear and segmental distribution, with heterogeneous and clustered ring enhancement are associated with malignant lesions. Various lesions and conditions present as NME. Malignant lesions include ductal carcinoma in situ (DCIS), intraductal component of invasive carcinoma, and invasive lobular carcinoma. Benign lesions include fibrocystic change. These knowledge helps to diagnose lesions presenting as NME.