Intraluminal duodenal diverticulum: radiological and endoscopic ultrasonography findings of an unusual cause of acute pancreatitis

Intraluminal duodenal diverticulum is a rare congenital web of membrane whi ch may be symptomatic when it becomes distended. This report describes a ca se revealed by presenting as an acute pancreatitis. The radiological findin gs are reported. The findings at CT, upper gastro-intestinal series, endosc opic ultrasound and endoscopic retrograde cholangiopancreatography are desc ribed and differential diagnostic features from choledochocele and duodenal duplication are discussed. By endoscopic ultrasonography, observation of a thin wall, without different layers such as choledochocele or duodenal dup lication, may be useful for diagnosis.