Novel Body Composition Measurements in Association With Outcomes of Breast Reconstruction Reconstruction

Inclusion Criteria: 1. Patients must have histologically confirmed breast malignancy or increased risk of developing a breast malignancy. 2. Age ≥ 18 years. 3. Scheduled to undergo mastectomy with immediate breast reconstruction using a permanent implant, tissue expander, or autologous tissue (e.g. Deep Inferior Epigastric Perforator (DIEP) flap, muscle-sparing Transverse Rectus Abdominis Myocutaneous (msTRAM) flap, Profunda Artery Perforator (PAP) flap). 4. Ability to understand a written informed consent document, and the willingness to sign it. Exclusion Criteria: 1. Any significant medical condition or laboratory abnormalities, which places the subject at unacceptable risk if he/she were to participate in the study. 2. Pregnant or breastfeeding. 3. Patients assigned male at birth. 4. Non-cisgender women. 5. Patients with implanted electronic medical devices (e.g. pacemaker, defibrillator). 6. Patients with prosthetic limbs.