Bilateral arm measurements
OtherPts treated with ALND, bilateral arm measurements will be obtained using the Perometer (Model 350 NT Perometer, Per-System) circumferential arm measurements with elastic tape taken at 4-cm intervals from the wrist to the shoulder & the L-Dex U400 (Impedimed, Brisbane, Australia) for bioimpedance measurements. Measurements will be performed before surgery, post-operatively & at timepoints of 6,12,18, & 24 months after surgery for 2 years will be obtained using the Perometer (Model 350 NT Perometer, Per-System) for bioimpedance measurements. Pts who have not yet developed lymphedema by 2 years, an additional measurement at approx 3 years post-surgery will be performed. If pt is diag with lymphedema at the 3-year visit, she will be asked to continue on study for an additional year. Pts treated with SLNB alone, following re-consent, a long-term follow-up volumetric arm measurement will be obtained using the perometer & circumferential arm measurements at a minimum of 2 years post-surgery.