Pancreatic neck transection after a handlebar injury: what the ERCP result actually means
A 10-year-old boy falls onto his bicycle handlebar. He arrives alert, with severe epigastric pain and one episode of emesis. Heart rate 118, blood pressure 108/70, respirations 24. There are no external injuries and the abdomen is tender in the epigastrium without peritoneal signs. FAST is negative. Contrast CT shows a grade III pancreatic injury - a full-thickness laceration through the neck of the pancreas with 2 cm of peripancreatic fluid - and no other injury. Lipase is 1560 U/L. He improves after 20 mL/kg of crystalloid, and his heart rate falls to 100. Serum glucose and calcium are normal.
1. What is your disposition and immediate plan, and which complication are you specifically trying to prevent?
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He is hemodynamically stable with a negative FAST, so this is not an operative emergency. He needs admission to a monitored bed with serial abdominal examinations by the same team, intravenous fluids, analgesia, antiemetics, and initially nothing by mouth with a nasogastric tube if he vomits. There is no role for prophylactic antibiotics, and repeating the lipase adds nothing - the level does not correlate with injury severity or with duct disruption.
The complication I am trying to prevent is an unrecognized main pancreatic duct disruption, which leads to a persistent leak, a pseudocyst, prolonged ileus, and occasionally infection or erosion into a vessel. CT grade correlates poorly with duct integrity, so the next step is duct imaging - MRCP or ERCP - within the first 24 to 48 hours. ERCP is both diagnostic and therapeutic and is the better single test if the child will tolerate it, because a stent can be placed at the same session if continuity exists.
I would also explain to the family up front that the child will likely be in hospital for a week or more and that a pseudocyst may still develop even with optimal early care.
2. ERCP demonstrates contrast extravasation at the laceration with no continuity between the proximal and distal duct. What are your options, and how do you choose between them?
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Complete transection means a stent cannot bridge the gap; a transpapillary stent placed from the duodenum will sit in the proximal duct and drain nothing downstream, so stenting is not a solution to a discontinuity, although it may still decompress the proximal system.
The options are: early distal pancreatectomy with splenic vessel preservation, which removes the leaking segment and is definitive; Roux-en-Y pancreaticojejunostomy to the distal stump, which preserves parenchyma and is chosen when the distal remnant is viable and its duct is identifiable; or observation, letting a pseudocyst mature and then draining it endoscopically or surgically.
The deciding factors are the patient's stability and trajectory, whether the distal gland is viable, how much parenchyma would be lost, and how much time has elapsed since injury. In a stable child with complete transection and a healthy distal remnant, I would favor early distal pancreatectomy with splenic preservation, because it definitively removes the leak and shortens the course; Roux-en-Y drainage of the distal stump is the alternative when the remnant is worth preserving and the duct can be found. If the child were improving with a contained leak, observation toward a pseudocyst is legitimate. Clinically significant endocrine insufficiency is uncommon because the majority of the gland remains.
3. On day 5 he develops fever, bilious emesis, and a 6 cm fluid collection on CT with gastric compression. How does this change your plan?
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This is a pseudocyst causing gastric outlet obstruction, and the fever raises the question of infection. The first step is to characterize it: repeat contrast CT looking for gas within the collection, blood cultures, and a decision about whether he is septic or simply obstructed. A mature, walled-off collection with gas in a febrile child is infected necrosis and needs drainage.
Fever alone is not an automatic indication for drainage, but gastric compression with bilious emesis is symptomatic and warrants intervention. If the collection is apposed to the stomach and the wall is sufficiently mature, endoscopic cystogastrostomy is the least invasive effective option; percutaneous drainage is reasonable if the collection is immature or not apposed to the stomach, accepting the risk of a pancreaticocutaneous fistula; surgical drainage is reserved for failure of the other routes or an unstable patient.
Nutrition runs in parallel: nasojejunal feeding or parenteral nutrition rather than repeated attempts at gastric feeding. I would avoid operating on an immature pseudocyst wall, and I would not perform a drainage procedure on a collection that is asymptomatic and merely large.