If--as we hope--the surgery was done correctly--you would not have a malpractice lawsuit: a malpractice suit is designed to compensate you for the costs, suffering, injury, etc. of bad medical care, so if you were not injured, there is no compensation due you. It is possible, however, that not disclosing who was conducting the surgery was an ethical violation; if you feel, as you state, violated, you may wish to report this to the state board or agency which licenses doctors.