If you've had weight loss surgery in the past which has not worked, or worked for a while and then failed, or maybe just been plagued by complications, your surgeon may recommend revisional surgery.
It may mean simply correcting a problem with what you have, or may involve converting your previous (failed) operation into another type of operation
Some well known revisional procedures include:
Repositioning of a slipped gastric band
Conversion of a vertical banded gastroplasty (the old "gastric stapling") into a modern gastric bypass
Removal of a failed band, with conversion to a sleeve gastrectomy or bypass
Adding a duodenal switch to to previous sleeve gastrectomy
Revisional surgery is usually quite complex and the decision to have it should not be taken lightly. Due to the potential risks and complications, it should be planned carefully.