Chronic Pancreatitis
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Direct answer
Chronic pancreatitis is irreversible destruction of acinar tissue with fibrosis, duct distortion and, in advanced disease, exocrine and endocrine failure — pain first, then steatorrhoea, then diabetes — driven most often by alcohol, but in India shadowed by a disease almost unique to it: tropical calcific pancreatitis of the young, non-alcoholic patient from southern India, presenting with disabling pain, dense ductal calculi and the fibrocalculous pancreatic diabetes that follows. The gross pathology is the signature the examination wants — a hard, fixed gland with a dilated, chain-of-lakes duct packed with stones — and the long-term risks are narcotic dependence, malnutrition and a markedly raised pancreatic carcinoma risk.
What you must remember
- Aetiology (TIGAR-O): Toxic-metabolic (alcohol, smoking), Idiopathic, Genetic (PRSS1, SPINK1 and CFTR variants), Autoimmune (IgG4-related disease, responsive to steroids), Recurrent severe acute pancreatitis, Obstructive (tumour, divisum).
- Alcoholic chronic pancreatitis: the prototypic form — toxic injury plus protein plugs calcifying in ducts; the patient typically has had years of heavy intake before the first pain attack.
- Tropical calcific pancreatitis: non-alcoholic young patients, classically from Kerala and other southern states; large intraductal calculi, duct dilatation, pain proceeding to diabetes; fibrocalculous pancreatic diabetes (FCPD) is typically ketosis-resistant because residual beta-cell function persists; reported associations with SPINK1 gene variants.
- Pathology triad: acinar loss, interlobular fibrosis, and duct changes — strictures alternating with dilatation producing the chain-of-lakes pancreatogram.
- Exocrine failure: steatorrhoea appears when over about 90 per cent of enzyme secretion is lost, hence late; treated with enteric-coated enzyme supplements and fat-soluble vitamin replacement.
- Endocrine failure: type 3c diabetes — requires insulin once established; brittle because glucagon deficiency removes the counter-regulatory buffer.
- Complications: pseudocyst (may bleed or compress), splenic vein thrombosis with gastric varices (a classic surgical question), bile duct stricture with jaundice, and pancreatic carcinoma risk elevated several-fold.
- Autoimmune pancreatitis (type 1): IgG4-associated, gland diffusely sausage-shaped with capsule-like rim, elevated serum IgG4, dramatic steroid response — the one form that reverses.
Two patients, one duct, two continents
A 45-year-old brewery worker with fifteen years of heavy intake has recurring epigastric pain radiating to the back, foul-smelling floating stools and newly abnormal glucose; his computed tomography shows a calcified, atrophic gland and a dilated main pancreatic duct with multiple stones — alcoholic chronic pancreatitis in its textbook form. Across the ward, in an Indian teaching hospital, the same radiograph belongs to a 19-year-old agricultural labourer from rural Tamil Nadu who has never touched alcohol: recurrent severe abdominal pain since early adolescence, gross intraductal calculi filling a dilated duct, and a random glucose now in the diabetic range. This is tropical calcific pancreatitis — described from Kerala long before it appeared in Western texts — and the diabetes that follows is fibrocalculous pancreatic diabetes, peculiarly ketosis-resistant, prone to brittle glycaemic swings, and demanding insulin because tablets fail as the gland fibroses.
Both patients illustrate the same pathological arithmetic: pain comes early while neural inflammation and duct pressure persist, steatorrhoea comes late because enzyme reserve must fall below a tenth of normal, and diabetes comes last. Management follows the arithmetic — alcohol cessation and analgesia first, enzyme replacement for steatorrhoea, insulin for the diabetes, and endoscopic or surgical drainage reserved for intractable pain or obstructed ducts. The Indian addition to the standard answer — naming tropical calcific pancreatitis and its FCPD sequence — is precisely what distinguishes a prepared candidate in this country's vivas.
Where students slip
Chronic pancreatitis is described as "repeated acute attacks"; the defining concept is irreversible structural destruction, and pain-free intervals with normal function characterise mild acute disease instead — merging them loses the definitional mark. The diabetes is filed as type 2; type 3c pancreatic diabetes lacks the counter-regulatory glucagon reserve, making hypoglycaemia frequent and insulin mandatory once established. Finally, autoimmune pancreatitis is offered surgery as a mass lesion; the sausage-shaped gland with raised IgG4 responds to steroids, and resecting it is the classical diagnostic disaster examiners love to describe.
Frequently asked questions
What are the three cardinal pathological features of chronic pancreatitis?
Acinar loss, interlobular fibrosis and duct distortion with strictures and dilatation — the chain-of-lakes duct, often with intraductal calculi.
What is tropical calcific pancreatitis?
A non-alcoholic chronic pancreatitis of young patients, classically from southern India, with large intraductal calculi, pain and eventual diabetes; SPINK1 variants are reported associations.
Why is fibrocalculous pancreatic diabetes ketosis-resistant?
Residual beta-cell function usually persists sufficient to suppress ketogenesis, though insufficient to prevent hyperglycaemia — unlike type 1 diabetes.
Why does steatorrhoea appear late in chronic pancreatitis?
Enzyme secretion must fall below roughly 10 per cent of normal before fat malabsorption develops, so exocrine failure is a late marker of advanced destruction.
Which vascular complication is classical of chronic pancreatitis?
Splenic vein thrombosis — thrombosis of the vein embedded in the inflamed gland producing left-sided (isolated gastric) portal hypertension and gastric varices.
Which form of chronic pancreatitis responds dramatically to steroids?
Type 1 autoimmune (IgG4-related) pancreatitis — diffuse gland enlargement with capsule-like rim, raised serum IgG4 and rapid steroid response.