Various regional anesthesia techniques, either individually or in combination, can be utilized for analgesia in breast cancer surgery. This study aims to map the cutaneous sensory block areas of different regional anesthesia techniques (serratus anterior plane block, parasternal block, and interpectoral + pectoserratus plane block) applied to patients undergoing breast cancer surgery. Furthermore, the extent to which these blocks cover the modified radical mastectomy incision will be assessed. The study seeks to comparatively determine the minimum and maximum sensory spread of each block. Ultimately, the findings are intended to provide valuable data for developing tailored perioperative pain management strategies specific to the surgical procedure and individual patient needs.