title: Portal annular pancreas. A rare variant and a new classification.
abstract: BACKGROUND
  Portal annular pancreas is a rare congenital anomaly resulting from fusion of the pancreatic parenchyma around the portal vein/superior mesenteric vein. It is asymptomatic, but could have serious consequences during pancreatic surgery, if unrecognized. We describe a variant of this anomaly encountered during pancreaticoduodenectomy and propose a new classification.
  
  
  METHODS
  We report a 51-year-old male who underwent a pancreaticoduodenectomy for periampullary carcinoma. After division of the pancreatic neck, a sheath of tissue was found posterior and extending to the left of the portal vein. When we divided this tissue, a large duct was encountered; this duct communicated with the main pancreatic duct. On review of the CT images, the main pancreatic duct was seen to be passing posterior to the portal vein and a smaller accessory pancreatic duct was present anterior to the portal vein. We describe the surgical implications.
  
  
  CONCLUSIONS
  This variant of portal annular pancreas has not yet been reported during pancreaticoduodenectomy and we propose a new classification for this fusion anomaly.
authors.affiliation: Department of General Surgery Unit IV (Hepato-Biliary Pancreatic Surgery), Christian Medical College, Vellore, Tamil Nadu, India. pj1982@cmcvellore.ac.in
authors.forename: Philip
authors.initials: P
authors.lastname: Joseph
authors.forename: Ravish Sanghi
authors.initials: RS
authors.lastname: Raju
authors.forename: Frederick Lorence
authors.initials: FL
authors.lastname: Vyas
authors.forename: Anu
authors.initials: A
authors.lastname: Eapen
authors.forename: Venkatramani
authors.initials: V
authors.lastname: Sitaram
mesh_terms: D000013:Congenital Abnormalities / Q000145:classification* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D010179:Pancreas / Q000002:abnormalities* / Q000601:surgery; D010182:Pancreatic Diseases / Q000145:classification / Q000151:congenital* / Q000601:surgery; D016577:Pancreaticoduodenectomy / Q000379:methods; D035583:Rare Diseases / Q000145:classification / Q000151:congenital / Q000601:surgery