This document discusses oncoplastic surgery techniques for breast-conserving surgery. It begins by reviewing the size limits and criteria for conservative breast cancer treatment. It then introduces oncoplastic surgery techniques which integrate plastic surgery to enable wider excisions and better cosmetic outcomes, extending the limits of breast conservation. Various oncoplastic techniques are described including volume replacement using latissimus flaps and volume displacement using mammoplasty techniques. Studies show oncoplastic surgery does not negatively impact oncologic outcomes while improving cosmesis, though it requires careful patient selection and training to perform.