Pancreas Pathology
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Direct answer
Pancreatic pathology divides into inflammatory disease — acute pancreatitis from gallstones and alcohol, chronic pancreatitis with fibrosis, ductal calcification and steatorrhoea, and the Indian-environment form tropical chronic pancreatitis — and neoplasia, dominated by ductal adenocarcinoma of the head presenting with painless obstructive jaundice. Enzymatic fat necrosis saponifies calcium and explains hypocalcaemia in severe attacks, while collections maturing beyond four weeks without an epithelial lining become pseudocysts. The cystic neoplasms (serous, mucinous, intraductal papillary mucinous) are separated from pseudocysts by one histological question — is there epithelium? — and the functional endocrine tumours, insulinoma and gastrinoma, complete the syllabus with syndromes FMGE tests by name.
What you must remember
- Acute pancreatitis: gallstones and alcohol together account for most Indian cases; lipase is the more specific serological marker; severity follows interstitial versus necrotising disease (modified Atlanta classification).
- Hypocalchaemia logic: liberated pancreatic enzymes convert peripancreatic fat into calcium soaps — the classic biochemical question.
- Pseudocyst definition: a fluid collection at least four weeks old, rich in amylase, encapsulated by granulation tissue with no epithelial lining.
- Tropical (fibrocalculous) chronic pancreatitis: young patients from southern India, large-duct calcification, early insulin-dependent diabetes and steatorrhoea, without alcohol; genetic susceptibility is described.
- Ductal adenocarcinoma: two-thirds arise in the head with painless progressive jaundice and a palpable non-tender gallbladder (Courvoisier's law); CA 19-9 monitors but does not screen; perineural invasion is characteristic.
- Cystic neoplasm rules: serous microcystic adenoma (glycogen-rich clear cells, central stellate scar, benign) versus mucinous cystic neoplasm (thick-walled, ovarian-type stroma, women, malignant potential) and IPMN (main-duct type carries highest malignancy risk).
- Endocrine tumours: insulinoma is the commonest functional islet tumour (Whipple triad, hypoglycaemia); gastrinoma causes Zollinger-Ellison syndrome with multiple resistant ulcers, often duodenal and MEN1-associated; autoimmune pancreatitis (IgG4) responds to steroids.
Two patients with pancreatic masses
A 62-year-old presents with painless deepening jaundice, clay-coloured stools and eight kilograms of weight loss; examination finds a palpable non-tender gallbladder, and imaging shows a head mass with ductal and pancreatic duct dilation (the double-duct sign). CA 19-9 supports, staging CT decides resectability, and a Whipple pancreaticoduodenectomy offers the only cure — though most present unresectable. Contrast a 40-year-old woman with a multilocular thick-walled body cyst: the crucial question is epithelium. A history of prior pancreatitis with gradual maturation favours pseudocyst; a cyst without inflammatory history, with ovarian-type stroma on histology, is a mucinous cystic neoplasm needing complete excision because of malignant potential. The same organ thus produces a fatal infiltrating cancer of the head and a curable cystic neoplasm of the body, and the discriminator is often a careful history plus one slide of the cyst wall.
Where students slip
Courvoisier's law is misquoted: it states that a palpable gallbladder in a jaundiced patient makes gallstone obstruction unlikely, because stones cause chronic fibrotic thickening — the mass, not the stone, distends the gland. Pseudocyst questions fail on timing and lining: under four weeks it is a collection, and any epithelial lining disqualifies "pseudo". Students also blend insulinoma and gastrinoma — remember Whipple triad drives insulinoma, recurrent jejunal ulcers and diarrhoea drive gastrinoma, and both belong to MEN1 syndromes.
Frequently asked questions
Why does severe acute pancreatitis cause hypocalcaemia?
Saponification — peripancreatic fat necrosis consumes calcium to form insoluble calcium soaps, lowering serum calcium in proportion to necrosis.
What defines a pancreatic pseudocyst?
A mature encapsulated collection at least four weeks after pancreatitis, lined by granulation tissue without epithelium and rich in pancreatic enzymes.
What distinguishes Indian tropical chronic pancreatitis?
Early onset in southern Indian populations, large pancreatic duct calculi, diabetes and steatorrhoea without alcohol, with described genetic susceptibility.
Which cystic pancreatic neoplasm is benign?
Serous microcystic adenoma with glycogen-rich clear cells and a central stellate scar, in contrast to mucinous cystic and intraductal papillary neoplasms.
What is autoimmune pancreatitis?
An IgG4-associated fibroinflammatory disease producing a sausage-shaped pancreas and obstructive jaundice that respond dramatically to corticosteroids.