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Duodenal duplication cyst is rarely located inside the liver. We present an extremely rare case of a 12-year-old girl with a large intrahepatic duodenal duplication cyst and a preduodenal portal vein. She was incidentally diagnosed with a large liver cyst (6.5 × 6.1 × 3.6 cm) containing air and fluid with a preduodenal portal vein after a systemic computed tomography scan for suspected internal injuries because of a traffic accident. The upper gastrointestinal series revealed that the cyst communicated with the duodenal bulb via a wide stalk. Upper gastrointestinal endoscopy revealed a large entry hole to the cyst at the duodenal bulb. Biopsy of the inner surface of the cyst revealed that the alimentary mucosa resembled that of the duodenum. She had no symptoms; therefore, continued observation was recommended as the sole management option. This is the third case of this extremely rare condition reported in the literature. This report describes and compares the common features of the three cases.

Duodenal duplication cyst consists 6% of alimentary tract duplications and the prevalence is estimated to be less than 1 per 100,000 live births. This report is the first case report in a pediatric patient. A 19-month-old female patient was detected with a 5.2 cm sized intrahepatic cystic lesion in her follow-up ultrasonography examination for hydronephrosis. In her regular check-up, findings suggestive of food materials were detected inside the cyst. Further evaluation showed a 7 cm sized cyst located inside segment IV of the liver, connected to the duodenal bulb with a possibility of biliary communication. On exploration, duodenal duplication cyst with a 1.5 cm long stalk starting from the duodenal bulb to the hilum of the liver was identified. Due to its sophisticated location and possible communication with the biliary tree, Roux-en-Y cystojejunostomy was performed after resecting the stalk. The histopathologic finding of the stalk showed serosa, muscle, submucosa and duodenal mucosa which suggested its duodenal origin. The patient has been followed up without any complications for 7 months.

Duodenal duplication cysts are rare congenital abnormalities. We report the case of a 16 year old female who presented with pancreatitis and duodenal intussusception and was subsequently diagnosed with heterotaxy, malrotation and a duodenal duplication cyst. She underwent open surgical management with successful excision of the cyst. The literature is reviewed and discussed.

Highlights • Gastrointestinal tract duplication cysts as congenital malformations. • Duodenal duplication cyst extending into the posterior mediastinum. • It can be misdiagnosed even in surgery., Introduction Duodenal duplication is a rare congenital malformation. Although more frequent in childhood, it is rarely observed in adulthood. Preoperative diagnosis can be difficult. Presentation of case We report a case of 42 year-old woman with duodenal duplication cyst situated in the posterior mediastinum, who was misdiagnosed even after a primary surgery. Detailed diagnostic workup and a second operation was done. Discussion This article discusses the incidence of duodenal duplications, their types and clinical presentations, the radiologic and diagnostic features with different therapeutic options. Conclusion Duodenal and the other intestinal duplication cysts should be considered in the differential diagnosis of oral contrast enhanced intrathoracic lesions in thorocoabdominal computerised tomography imaging.

Duodenal duplication cysts are unusual congenital anomalies. Both intestinal malrotation and duodenal duplication may cause extrinsic duodenal obstruction. We report a case of a 5-month-old boy who presented with signs of duodenal obstruction caused by intestinal malrotation, volvulus and a duodenal duplication cyst.

A four year old boy with a duplicated gall bladder communicating with a duplication cyst of the duodenum is reported for the first time in the literature. It is also reported for the absence of any connection with the biliary system.

Duodenal duplication cysts are rare congenital anomalies that can cause acute pancreatitis. Pancreas divisum is also a congenital anomaly, often discovered incidentally, but is considered a possible cause of acute pancreatitis. We report the case of the combination of both anomalies causing recurrent episodes of acute pancreatitis in a young man. Endoscopic treatment by partial excision of the cyst with a polypectomy snare and sphincterotomy of the minor papilla was successful.

Duodenal duplication cysts are rare congenital malformations of which there is limited literature in the pediatric population. The most common presentation in symptomatic patients is abdominal pain and pancreatitis. We present a case of a 14 year old female that presented with emesis, abdominal pain, weight loss, and admission biochemical profile concerning for acute pancreatitis in conjunction with severe hypochloremic, hypokalemic metabolic alkalosis. Further imaging was highly suggestive of duodeno-duodenal intussusception causing obstruction of the pancreatic duct. Patient was taken emergently to the operating room for exploration. Patient underwent laparoscopic assisted reduction of intussusception and resection of duodenal duplication cyst. Patient tolerated the surgery well, and was able to be discharged home in stable condition soon after. There have been no cases reported in the literature that describe pancreatitis secondary to intussusception of duodenal duplication cyst. When diagnosed early, these patients can be safely managed laparoscopically even in emergent settings.

Gastrointestinal duplications are rare congenital anomalies. Five percent to 10% of them are found in the duodenum. Traditionally, these lesions are treated surgically using either a laparoscopic or open transduodenal approach. We present the successful endoscopic treatment of a symptomatic duodenal duplication cyst in a 9-year-old girl.

This case report describes a unique variant of a duodenal duplication cyst in an 8-year-old boy who had recurrent episodes of upper abdominal pain. Imaging revealed a stone-containing cyst near the biliaropancreatic ducts and concomitant hydrops of the gallbladder. Open transduodenal marsupialization of the cyst and resection of the inflamed gallbladder were performed. Further episodes of pancreatitis did not occur for a follow-up of 2 years.

Cystic duplication of the duodenum is a rare anomaly of the gastrointestinal tract. Patients may present in early childhood with symptoms of upper intestinal obstruction. Successful, staged management of a cystic duodenal duplication in an 880-g infant is described.

A case of transdiaphragmatic duodenal duplication in a premature infant is presented. Vertebral abnormalities, which have invariably accompanied this disorder in reported cases so far, were characteristically absent. Therefore, the initial tentative diagnosis was right-sided diaphragmatic hernia. Barium examination was helpful in preoperative diagnosis.