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Annular pancreas
     
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Annular pancreas

 

An annular pancreas is a ring of pancreatic tissue that encircles the duodenum (the first part of the small intestine). The normal position of the pancreas is next to, but not surrounding the duodenum.

Annular pancreas is problem present at birth (congenital defect). Symptoms occur when the ring of pancreas squeezes and narrows the small intestine so that food cannot pass easily or at all.

Newborns may have symptoms of complete blockage of the intestine. However, up to one half of people with this condition do not have symptoms until adulthood. There are also cases that are not detected because the symptoms are mild.

Conditions that may be associated with annular pancreas include:

  • Down syndrome
  • Excess amniotic fluid during pregnancy (polyhydramnios)
  • Other congenital gastrointestinal problems
  • Pancreatitis

Symptoms

 

Newborns may not feed well. They may spit up more than normal, not drink enough breast milk or formula, and cry.

Adult symptoms may include:

  • Fullness after eating
  • Nausea or vomiting

 

Exams and Tests

 

Tests include:

  • Abdominal ultrasound
  • Abdominal x-ray
  • CT scan
  • Upper GI and small bowel series

 

Treatment

 

Treatment most often involves surgery to bypass the blocked part of the duodenum.

 

Outlook (Prognosis)

 

The outcome is most often good with surgery. Adults with an annular pancreas are at increased risk for pancreatic or biliary tract cancer.

 

Possible Complications

 

Complications may include:

  • Obstructive jaundice
  • Pancreatic cancer
  • Pancreatitis (inflammation of the pancreas)
  • Peptic ulcer
  • Perforation (tearing a hole) of the intestine due to obstruction
  • Peritonitis

 

When to Contact a Medical Professional

 

Call your health care provider if you or your child has any symptoms of annular pancreas.

 

 

References

Barth BA, Husain SZ. Anatomy, histology, embryology and developmental anomalies of the pancreas. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease: Pathophysiology/Diagnosis/Management. 10th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 55.

Bales C, Liacouras CA. Intestinal atresia, stenosis, and malrotation. In: Kliegman RM, Stanton BF, St. Geme JW, Schor NF, eds. Nelson Textbook of Pediatrics. 20th ed. Philadelphia, PA: Elsevier; 2016:chap 330.

Semrin MG, Russo MA. Anatomy, histology, and developmental anomalies of the stomach and duodenum. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease: Pathophysiology/Diagnosis/Management. 10th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 48.

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  • Digestive system

    Digestive system

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  • Endocrine glands

    Endocrine glands

    illustration

  • Annular pancreas

    Annular pancreas

    illustration

    • Digestive system

      Digestive system

      illustration

    • Endocrine glands

      Endocrine glands

      illustration

    • Annular pancreas

      Annular pancreas

      illustration

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          Review Date: 10/26/2017

          Reviewed By: Michael M. Phillips, MD, Clinical Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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