A round lump with a well-defined outline is, in most cases, benign. However, in10 to 20% of all cases, a round and well-defined lump may correspond to a cancer. Mostoften, it consists of grade III infiltrating ductal carcinoma (IDC). Other histological sub-typesmay provide round masses with smooth contours: colloid carcinoma (still called mucinous car-cinoma), medullary carcinoma, intramammary metastases, intra-cystic papillary carcinoma,lymphoma and high-grade phyllode tumours. © 2013 Éditions françaises de radiologie. Published by Elsevier Masson SAS. All rights reserved.
Larribe, M., Thomassin-Piana, J., & Jalaguier-Coudray, A. (2014). Breast cancers with round lumps: Correlations between imaging and anatomopathology. Diagnostic and Interventional Imaging. Elsevier Masson SAS. https://doi.org/10.1016/j.diii.2013.04.003