Pancreatic Surgery
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Not every pancreatic operation is a Whipple: distal pancreatectomy for body and tail tumours, enucleation for small neuroendocrine tumours away from the duct, central pancreatectomy for neck lesions, and duodenum-preserving head resections complete the surgeon's options. Distal pancreatectomy can spare the spleen by preserving the splenic vessels (Kimura) or dividing them and relying on short gastric collaterals (Warshaw). Pancreatic fistula, defined and graded by the ISGPS, dominates the morbidity of all pancreatic surgery, and intraductal papillary mucinous neoplasms are triaged by the Fukuoka criteria between surveillance and resection.
What you must remember
- Distal pancreatectomy removes pancreas from neck to tail, with or without the spleen; preservation is preferred in the young to avoid postsplenectomy sepsis.
- Kimura preserves the splenic artery and vein by meticulous dissection; Warshaw ligates them at the hilum and relies on short gastric collaterals — quicker, but risks splenic infarction and perigastric varices.
- Enucleation suits small (under 2 cm) neuroendocrine tumours away from the main duct — insulinoma the archetype; intraoperative ultrasound guards it.
- Central (middle) pancreatectomy for neck lesions preserves spleen and distal pancreas at the price of two transection lines and a higher fistula rate — for benign or low-grade lesions in the young.
- ISGPS postoperative pancreatic fistula (2016): drain fluid amylase at least three times serum on or after day 3; a "biochemical leak" has no clinical consequence, while grades B and C mean clinical fistula, C adding organ failure or reoperation.
- Fukuoka high-risk stigmata for IPMN: obstructive jaundice, main pancreatic duct 10 mm or more, and enhancing mural nodule — any one mandates resection; worrisome features (cyst 3 cm or more, duct 5–9 mm, thickened walls, rapid growth) trigger EUS.
- Main-duct and mixed IPMN carry higher malignant potential than branch-duct disease; almost all main-duct IPMNs are resected.
- Infected pancreatic necrosis follows the step-up approach — antibiotics, percutaneous or endoscopic drainage, then minimally invasive necrosectomy — delayed beyond four weeks when possible.
Working through a cystic lesion
A 48-year-old woman has a 3.2 cm unilocular cyst in the pancreatic body found on ultrasound for dyspepsia; she is asymptomatic, CA 19-9 normal. The pathway is Fukuoka. A cyst of 3 cm or more is a worrisome feature, so the next step is characterisation, not surgery: MRI/MRCP to map the cyst and main duct, then EUS with fluid analysis for amylase and CEA. A markedly raised CEA (over about 200 ng/mL) supports a mucinous lesion; amylase in the thousands suggests a pseudocyst or side-branch communication. Say the MRI shows a communicating side branch and EUS a mural nodule: this branch-duct IPMN with a high-risk feature is resected — distal pancreatectomy, spleen preserved by the Kimura method. Had the cyst been 1.5 cm without features, surveillance MRI at 6–12-month intervals would be correct — knowing that branch-duct IPMN can be watched is as examinable as knowing when to operate.
Where students slip
The fistula question exposes candidates who memorise without understanding: the slip is calling every drain output a fistula. The ISGPS definition demands amylase three times serum on or after day 3, and a transiently high drain amylase in a well patient is a biochemical leak, not a fistula. The second slip is forgetting that a soft, normal pancreas with a small duct is the highest-risk gland for fistula, while a fibrotic gland leaks least — the gland, not the operation, sets the risk. Adding that grade C fistula with haemorrhage or organ failure demands angiography and reoperation marks out the prepared candidate.
Frequently asked questions
How can the spleen be preserved during distal pancreatectomy?
Kimura preserves the splenic artery and vein; Warshaw divides both at the hilum and perfuses the spleen on short gastric vessels — faster, but risks splenic infarction and varices.
When is enucleation appropriate for a pancreatic tumour?
For small neuroendocrine tumours under 2 cm lying away from the main duct, typically insulinomas localised on intraoperative ultrasound, accepting a fistula risk for gland preservation.
How is a postoperative pancreatic fistula defined and graded?
Drain fluid amylase three times serum or more on or after day 3; a biochemical leak is clinically silent, grade B needs intervention, grade C adds organ failure or reoperation.
Which IPMNs are resected rather than surveyed?
Main-duct IPMN with a duct of 10 mm or more, any IPMN with obstructive jaundice or an enhancing mural nodule, and branch-duct IPMNs with worrisome features confirmed on EUS or positive cytology.
What is central pancreatectomy and why choose it?
Removal of the pancreatic neck and proximal body, with the distal pancreas preserved and drained into bowel, sparing spleen and endocrine function despite a higher fistula rate.
When should infected pancreatic necrosis be drained?
After about four weeks of walled-off maturation, using the step-up approach of antibiotics, percutaneous or endoscopic drainage first, and minimally invasive necrosectomy only if drainage fails.