Pain after breast surgery is usually treated with narcotics; however, these are associated with a high incidence of side effects such as itching, nausea and vomiting, constipation, urinary retention and dizziness. Another modality for pain control is regional anesthesia; thoracic paravertebral blocks [TPVB] using local anesthetics are particularly appealing for breast surgery. They provide good pain control, possibly blunting surgical stress response, and decrease the need for anesthetic agent. However, TPVB are not widely used, and the inherent risk associated with their placement, such as pneumothorax, nerve injury, bleeding and infection, makes them less appealing to patients. From a pain management point of view, paravertebral blocks may be the optimal approach for reducing pain and opiate consumption after breast cancer surgery. In addition, retrospective data suggest a reduction in cancer recurrence if this technique is used. Unfortunately, this effective technique is not widely performed because of the risk of pneumothorax and is only used in some centers. Our intent is to study an alternative approach with fewer risks.