Paravertebral Block Versus Erector Spinae Plane Block for Modified Radical Mastectomy in Womens.

postoperative pain following Modified radical mastectomy is severe specially after dissection of tissues .paravertebral plane block provides an excellent postoperative analgesia for women's,but it carry the risk of pneumothorax which it reported in some cases.Erector spinae plane block is a recent block has been mentioned in many case reports as a safe,quick and can be used in outpatient setting. we use a comparative study to compare the postoperative analgesia between both blocks and the affection of postoperative pain following both blocks if any on pulmonary functions.