Residual Breast Tissue After Four Types of Mastectomy: A Prospective, Comparative Study.

Background: Residual breast tissue (RBT), defined as glandular tissue left behind after mastectomy, raises concerns about oncologic safety. However, data on its prevalence and clinical significance remain limited, with existing studies hampered by small sample sizes and inconsistent methodologies. This study evaluated the prevalence of RBT across four mastectomy types-simple mastectomy (SM), modified radical mastectomy (MRM), skin-sparing mastectomy (SSM), and nipple-sparing mastectomy (NSM)-and identified factors influencing its presence.