The most recent advancement in anesthetic techniques for mastectomies is the SPB. The SPB is a novel technique first described by Fajardo et al in 2012 [2]. A single injection blocks many dermatomes at once. This technique could be an effective alternative to PVB or thoracic epidurals, because it is considered more feasible, safe than thoracic epidurals and results in a lower complication rate. But there are very few long term randomized studies to prove the efficacy of SPB.