CT-appearance of intraluminal duodenal diverticulum. The “halo” sign

MRI Findings of Intrinsic and Extrinsic Duodenal Abnormalities and Variations

“…Intraluminal duodenal diverticulum (IDD) is one of the most rarely seen congenital anomalies of the duodenum, and it is thought to arise from defects in the recanalization process of the primitive foregut in the early gestational period ( 12 13 14 15 ). Typically, it is seen at the 2nd section of duodenum, near the papilla Vateri ( 12 13 ). IDD is gender-free and is most frequently seen in the 3rd-5th decades ( 12 ).…”

“…Although it is mostly asymptomatic, sometimes it may cause early satiety, bloating, nausea, and/or vomiting based on partial or total duodenal obstruction ( 16 ). Forty percent of cases may be accompanied with GI and extraintestinal malformations, such as annular pancreas, midgut malrotation, imperforate anus, choledochocele, or superior mesenteric artery (SMA) syndrome as well as extraintestinal anomalies such as congenital heart disease, bladder extrophy, or hypoplastic kidney ( 12 13 14 ). In barium studies, IDD is seen as a pedunculated polypoid lesion that is projected into the real lumen and that is filled with barium, creating the appearance of what is called a pathognomonic "airport windsock" ( Fig.…”

“…In barium studies, IDD is seen as a pedunculated polypoid lesion that is projected into the real lumen and that is filled with barium, creating the appearance of what is called a pathognomonic "airport windsock" ( Fig. 7 ) ( 10 12 13 ). Lesions change place with peristaltism.…”