title: Beak sign in duodenal duplication cyst.
abstract: Duodenal duplication cyst is an uncommon congenital anomaly of the alimentary tract and preoperative diagnosis is important in relation to the surgical approach. This paper describes a beak-like projection of the duodenum in contrast studies which enabled a confident preoperative diagnosis of duodenal duplication cyst in four infants.
mesh_terms: D003560:Cysts / Q000000981:diagnostic imaging*; D004380:Duodenal Obstruction / Q000000981:diagnostic imaging*; D004386:Duodenum / Q000002:abnormalities* / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011859:Radiography