Complications Rarely, bezoars cause serious complications including Gastric outlet obstruction Gastrointestinal bleeding secondary to ulceration Ileus and intestinal obstruction Perforation and peritonitis Intussusception Diagnosis of Bezoars Endoscopy Bezoars are detectable as a mass lesion on imaging studies (eg, x-ray, ultrasound, CT) that are often done to evaluate the patient's nonspecific upper gastrointestinal symptoms.