This is a broad term that refers to surgery that is performed on a patient who has previously had weight loss surgery.
An example of this would be a gastric bypass in a patient who previously had a gastric band.
Revisional surgery involves more complex surgery due to there being altered anatomy following the original operation.
Revisional surgery has to be tailored to the individual patient and the lead-up to surgery usually requires more in-depth investigations and consultations compared to primary (first-time) surgery.