Lymphedema Surveillance Study

Inclusion Criteria: * Female breast cancer patients over the age of 18 * Patients consenting for unilateral axillary lymph node dissection (ALND) (prior history of sentinel lymph node biopsy allowed if \<6 months from consent) * Patients consenting for unilateral sentinel lymph node biopsy (SLNB) and possible ALND are eligible for initial entry into the study, but will become ineligible if ALND is not performed * Initially consented patients, treated with SLNB alone, who were originally considered ineligible to continue on study, will be approached for re-enrollment * Patients who self-identify as Black or White consenting for unilateral ALND or possible ALND will be approached for enrollment onto translational study (Cohort 3) Exclusion Criteria: * Male breast cancer patients * Patients consenting for bilateral axillary surgery * Patients with prior history of surgical excision of one or more axillary lymph nodes or SLNB, performed \>6 months from date of consent * Patients with prior history of ALND * Patients with no breast surgery performed at MSK