Gastrointestinal Foreign Body

• Etiology: anything
• Imaging: obtain AP mouth to anus radiograph and use lateral of foreign body to localize and characterize it, foreign bodies get stuck at cricopharyngeal sling at C6 / aortic arch / lower esophageal sphincter / pylorus of stomach / ileocecal valve
• Complications: long standing foreign bodies can cause soft tissue swelling leading to airway compression and narrowing + esophageal erosion / fistula
• Note: sagitally oriented coin is more likely in the esophagus than in the trachea
• Imaging of button battery: has beveled edge / halo / double rim on AP view + step off on lateral view while coin does not, two adjacent coins can mimic a button battery
• Complications of button battery: button battery in esophagus very susceptible to causing injury and must be removed immediately, button battery distal to esophagus is less susceptible to injury but it could have caused esophageal injury, esophageal injuries from button battery include tracheoesophageal fistula / perforation / stricture / aortoenteric fistula
• Imaging of rare earth magnets: suspect when multiple magnets attract each other or 1 magnet and 1 metallic foreign body attract each other
• Complications of rare earth magnets: rare earth magnets must be removed immediately as they can cause ulceration / ischemia / obstruction / perforation when two rare earth magnets in adjacent bowel loops attract each other

Cases of Gastrointestinal Foreign Body