The thyroid is removed either because it is functioning too much (making too much thyroid hormone), getting too large in low iodine conditions and compressing nearby structures (goiter) or in cases of thyroid cancer. All of these thyroid conditions have nothing to do with obesity or it's correction with Lap band surgery. Your anesthesiologist would need to know about the thyroid surgery just in case scarring distorts the direction of the airway. This should pose no threat to your lap band. Good luck.