Hi there, As a general surgeon I see a lot of gallbladder polyps. The American College of Surgeons and standard of care in the United States is to remove any gallbladder that has a polyp that is more than 1 cm. If hers is 2 cm, then she should definitely have her gallbladder removed, as it is possible that this could be cancer. No one can tell what it is until her gallbladder is removed and the pathologist examines it under a microscope. Usually, once the gallbladder is removed, the pathologist will look at the polyp and the gallbladder under a microscope. It usually takes about 3-5 days to get the results from the pathologist. Unfortunately, no one can give you an answer as to what it is unless it is removed. I d recommend your mother see a general surgeon and have her gallbladder removed as soon as possible. I hope this answers your questions. Please feel free to contact me should you have any further questions.