Annular pancreas is a medical condition where a band of pancreatic tissue surrounds the second part of the small intestine, causing digestive problems. Alternative synonyms for annular pancreas include "pancreatic annulus" and "pancreatic ring syndrome." Other terms that describe this condition include "circumferential pancreas," "encircling pancreas," and "pancreatic collar." While rare, it is more commonly diagnosed in children than adults and can lead to symptoms such as vomiting, abdominal pain, and weight loss. Treatment options may include surgery to remove the pancreatic tissue that is causing the obstruction or other medical management strategies.