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Pancreatic Pseudocyst - Final Year MBBS Complete Guide

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1. DEFINITION

• Lacks an epithelial lining (hence "pseudo" - distinguishing it from a true cyst)
• Contains amylase-rich fluid with pancreatic enzymes
• Has no solid/necrotic debris (if debris is present, it is called Walled-Off Necrosis, WON - not a pseudocyst)
• Takes at least 4 weeks to mature and develop a proper capsule

Key exam point: A pseudocyst develops ONLY after interstitial edematous pancreatitis (not necrotizing). If it follows necrosis and persists >4 weeks, it is WON.

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2. REVISED ATLANTA CLASSIFICATION (2012) - MUST KNOW

• The term "pancreatic abscess" is now obsolete (dropped from Atlanta 2012)
• The term "infected pseudocyst" is also discouraged

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3. EPIDEMIOLOGY

• Occurs in 5-15% of patients after acute pancreatitis
• More common after chronic pancreatitis (20-40% of cases)
• Most common pancreatic cystic lesion overall
• Located most often in the lesser sac, around the body/tail of pancreas
• Can also be found in: pelvis, scrotum, mediastinum, thorax (rare)

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4. ETIOLOGY / CAUSES

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5. PATHOGENESIS

1. Injury/inflammation → disruption of main pancreatic duct or its branches
2. Extravasation of enzyme-rich pancreatic juice into peripancreatic tissue
3. Intense inflammatory reaction in peritoneum, retroperitoneum, and serosa of adjacent organs
4. Granulation tissue and fibrosis form around the collection → capsule matures over 4-6 weeks
5. If duct-pseudocyst communication persists → cyst enlarges (can reach 20-30 cm)

• Xanthochromic (with hemorrhage)
• Purulent (with infection)

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6. D'EGIDIO CLASSIFICATION (Key for Exam + Management)

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7. CLINICAL FEATURES

• Patient with acute pancreatitis fails to recover after 1 week, OR
• Initial improvement followed by clinical deterioration

• Epigastric pain/discomfort (most common)
• Anorexia, nausea, vomiting
• Early satiety
• Low-grade fever
• Back pain
• Palpable epigastric mass (in large pseudocysts)

• Epigastric mass - smooth, rounded, non-tender (usually)
• Mild jaundice (if bile duct compressed)
• Serum amylase: fails to normalize or shows a secondary rise (2-4x normal) in ~50% of patients

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8. INVESTIGATIONS

CT Scan (Investigation of Choice)

• Contrast-Enhanced CT (CECT): accuracy approaching 100%
• Appears as: rounded, well-defined, low-attenuation, fluid-filled structure within or adjacent to the pancreas
• Non-operator dependent; useful for planning therapy
• Shows size, location, relation to adjacent structures

Ultrasound (USG)

• Good for detection; can show extent of fluid
• Limited by: bowel gas, patient habitus, operator skill
• Better than CT for solid tissue content within collection
• Used to guide FNA

Endoscopic Ultrasound (EUS)

• Better delineates internal septation than CT
• Useful to distinguish pseudocyst from cystic neoplasm
• Used for drainage guidance

MRCP/MRI

• Now preferred over ERCP for ductal anatomy
• Shows communication between pseudocyst and pancreatic duct

ERCP

• Historically used; now reserved for therapy (transpapillary drainage)
• Risk of introducing infection

Cyst Fluid Analysis (FNA via EUS)

• High amylase → pseudocyst (vs. cystic neoplasm)
• Low CEA, CA19-9 → favors pseudocyst
• Low or absent mucin → rules out mucinous neoplasms (IPMN, MCN)

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9. COMPLICATIONS (RRHM - Remember: Rupture, Rupture into GI, Hemorrhage, Mass effect)

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10. MANAGEMENT

Step 1: Watchful Waiting (Conservative)

• Up to 90% of acute peripancreatic fluid collections resolve spontaneously
• Asymptomatic pseudocysts: observe for at least 6 weeks
• Indications for intervention: symptomatic, enlarging, infected, or complicated pseudocyst

Step 2: Drainage (Three Routes)

A. Endoscopic Drainage (Now First-Line)

1. Endoscopic Transmural Drainage (cystogastrostomy/cystoduodenostomy)
   • EUS-guided placement of stents through stomach or duodenum wall into the pseudocyst
   • Requires pseudocyst to be within 1 cm of the gastric/duodenal wall
   • Lumen-apposing metal stents (LAMS) now used - superior to plastic stents (2026 meta-analysis [PMID: 41276442])
   • Preferred approach for most pseudocysts today
2. Transpapillary Drainage (via ERCP)
   • Wire passed through papilla, through pancreatic duct, into communicating pseudocyst
   • Best for pseudocysts that communicate with the main duct
   • Cannot be done if downstream ductal obstruction is present

B. Percutaneous Drainage

• CT or ultrasound-guided catheter drainage
• Risk: external pancreatic fistula (especially if ductal communication exists)
• Preferred for: infected pseudocysts, Type I (no ductal communication), critically ill patients
• Contraindication: do NOT drain externally if downstream ductal obstruction unrelieved - high fistula risk

C. Surgical Drainage (Internal)

1. Cystogastrostomy - posterior cystogastrostomy; pseudocyst drained into posterior wall of stomach (most common for pseudocysts in lesser sac/posterior to stomach)
2. Cystojejunostomy (Roux-en-Y) - best for: large pseudocysts, multiple pseudocysts, pseudocysts near duodenum
3. Cystoduodenostomy - for pseudocysts in head region closely adherent to duodenum

Critical rule from Maingot's: Never drain a pseudocyst externally if there is unrelieved downstream ductal obstruction - high risk of persistent external fistula.

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11. PSEUDOCYST vs. OTHER PANCREATIC CYSTS (Exam Favourite)

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12. SURGERY-SPECIFIC: KEY PRACTICAL POINTS

• Minimum maturity before surgery: 6 weeks (for a defined, thick wall suitable for anastomosis)
• EUS-guided drainage is the dominant approach today; metallic stents outperform plastic stents (2026 meta-analysis, [PMID: 41276442])
• For hemorrhage complication: angioembolization first, then surgery if embolization fails
• Infected pseudocyst: drain first (percutaneous/endoscopic), treat infection, then address duct anatomy
• Pancreatic ascites: diagnosed by very high ascitic fluid amylase; treat with octreotide ± ERCP/stenting ± surgery

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13. HIGH-YIELD EXAM SUMMARY

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• Maingot's Abdominal Operations (Pancreatic Pseudocyst chapter)
• Current Surgical Therapy 14e (Management of Pancreatic Pseudocyst)
• Sleisenger & Fordtran's Gastrointestinal and Liver Disease
• Schwartz's Principles of Surgery 11e
• Mulholland & Greenfield's Surgery 7e
• Recent 2026 meta-analysis on metallic vs plastic stents: [Chen H et al., HPB 2026, PMID: 41276442]

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Pancreatic Pseudocyst - History Taking & Clinical Examination

HOW TO APPROACH THIS CASE AS AN MBBS STUDENT

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PART 1: HISTORY TAKING

A. Chief Complaint

• Epigastric pain / upper abdominal pain
• Abdominal lump / swelling
• Nausea and vomiting
• Failure to recover after an episode of acute pancreatitis

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B. History of Present Illness (HPI)

1. Pain - SOCRATES

2. Associated Symptoms - Ask Specifically About:

• Nausea and vomiting
• Anorexia (loss of appetite)
• Early satiety ("Do you feel full after eating only a little?") - suggests gastric compression
• Vomiting of blood (hematemesis) or black/tarry stools (melena) - suggests hemorrhagic complication
• Change in bowel habits, pale/greasy stools (steatorrhea) - suggests exocrine insufficiency

• Fever - suggests infection of the pseudocyst
• Weight loss - important; also raises suspicion for malignancy

• Jaundice, dark urine, pale stools - suggests bile duct compression by the pseudocyst
• Pruritus (itching)

• Breathlessness, pleuritic chest pain - suggests pancreaticopleural fistula or pleural effusion (rare but important)

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C. Past Medical History

1. Previous episodes of pancreatitis - "Have you ever been told you had pancreatitis before?"
   • If yes: How many times? Were you hospitalized? Was it treated?
2. Gallstones - "Have you ever been told you have stones in your gallbladder?"
   • Biliary pancreatitis is a leading cause
3. Chronic pancreatitis - "Do you have a long-standing problem with your pancreas?"
4. Abdominal trauma - "Have you had any injury to your abdomen - road accident, sports, fall?" (trauma is a classic cause, especially in young patients)
5. Diabetes mellitus - new-onset diabetes may suggest pancreatic endocrine insufficiency
6. Hyperlipidaemia (raised triglycerides) - a recognized cause of pancreatitis
7. Peptic ulcer disease / GERD - for differential diagnosis
8. Any previous abdominal surgery or ERCP (iatrogenic cause)
9. Pancreatic malignancy - previous cancer, weight loss

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D. Drug History

• Steroids (prednisolone) - drug-induced pancreatitis
• Azathioprine, 6-mercaptopurine - pancreatitis
• Thiazide diuretics, furosemide - pancreatitis
• Tetracyclines, sulfonamides, valproate - pancreatitis
• NSAIDs - ulcer risk; differential
• Anticoagulants - bleeding risk relevant to hemorrhagic complications
• Any new medications started recently

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E. Family History

• Hereditary pancreatitis (autosomal dominant, PRSS1 mutation) - ask if family members have had pancreatitis
• Cystic fibrosis (in young patients) - associated with pancreatic disease
• Pancreatic cancer (for differential)

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F. Social History - THE MOST IMPORTANT PART

• "Do you drink alcohol?" → "How much per week?" → "For how long?"
• Quantify in units per week (1 unit = 10 mL pure alcohol)
• Chronic heavy alcohol use is the single most common cause of chronic pancreatitis and pseudocysts
• Use CAGE questionnaire if alcoholism suspected:
  • Cut down? Annoyed by criticism? Guilty? Eye-opener drink?

• Independent risk factor for chronic pancreatitis

• High fat diet → gallstones

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PART 2: GENERAL EXAMINATION

On General Inspection (from the end of the bed):

• Does the patient look well or unwell?
• Body habitus: cachexia/weight loss suggests chronic pancreatitis or malignancy
• Distress: pain, guarding posture (leaning forward - classic pancreatic pain relief posture)
• Jaundice: yellowish discoloration of skin/sclera (bile duct compression)
• Pallor: anemia from chronic disease or hemorrhage
• Signs of chronic liver disease (if alcohol-related): spider naevi, palmar erythema, leukonychia, parotid enlargement, gynecomastia, dupuytren's contracture, loss of body hair

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Vital Signs (Always Record):

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Hands and Upper Limbs:

• Palmar erythema - chronic liver disease (alcohol)
• Leukonychia (white nails) - hypoalbuminemia
• Clubbing - not typical of pancreatitis; if present, consider malignancy/IBD
• Dupuytren's contracture - alcoholism
• Peripheral edema - hypoalbuminemia
• Asterixis (liver flap) - hepatic encephalopathy if liver disease co-exists
• Jaundice in nail beds/palms

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Head, Face, and Neck:

• Scleral icterus (jaundice): look at the sclera in good light - earliest sign of jaundice
• Conjunctival pallor: anemia
• Parotid enlargement: alcoholism
• Xanthelasma: hyperlipidemia (a cause of pancreatitis)
• Lymphadenopathy: cervical/supraclavicular (Virchow's node - left supraclavicular - if malignancy)
• JVP: elevated in pericardial effusion (rare pancreatic complication)

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Chest:

• Respiratory: dull percussion + reduced breath sounds at left base → left-sided pleural effusion (common in pancreatitis and pancreatic pseudocyst via pancreaticopleural fistula)
• Spider naevi on chest/upper trunk → chronic liver disease

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PART 3: ABDOMINAL EXAMINATION

1. INSPECTION (Patient lying flat, abdomen exposed from nipples to groin)

• Abdominal distension: generalized (ascites from ruptured pseudocyst) or localized (epigastric mass)
• Visible peristalsis: gastric outlet obstruction by large pseudocyst
• Skin changes:
  • Grey Turner's sign: bluish-black discoloration of the flanks → retroperitoneal hemorrhage in severe pancreatitis
  • Cullen's sign: periumbilical bruising → intraperitoneal hemorrhage
  • (Both are rare but examiner favorites - indicate hemorrhagic pancreatitis or ruptured pseudocyst with bleeding)
• Scars: previous surgery (cholecystectomy scar = gallstone history; midline scar = previous pancreatitis surgery)
• Dilated veins: caput medusae → portal hypertension (splenic/portal vein thrombosis complicating pseudocyst)
• Striae: weight gain, Cushing's
• Jaundice of skin

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2. PALPATION

• Look at the patient's face for pain
• Note areas of tenderness: epigastric tenderness most common
• Guarding: involuntary muscle contraction over tender area
• Rigidity: board-like abdomen → rupture into peritoneum (peritonitis)

• Epigastric mass: the hallmark finding of a large pseudocyst
  • Location: epigastric / central upper abdomen
  • Character: smooth, rounded, non-tender (if uncomplicated), firm, well-defined
  • May be fluctuant (fluid-filled)
  • Moves with respiration (superficial masses don't)
  • Bowel gas resonant on percussion over it (rare - usually dull)
• Hepatomegaly: alcoholic liver disease or biliary obstruction
• Splenomegaly: splenic vein thrombosis (portal hypertension complicating pseudocyst)

A large pancreatic pseudocyst in the lesser sac may present as a smooth, rounded, non-pulsatile epigastric mass that is continuous with the stomach anteriorly - you cannot "get above it" easily.

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3. PERCUSSION

• Epigastric mass: usually dull to percussion
• Shifting dullness + fluid thrill: look for ascites (pancreatic ascites from ruptured pseudocyst)
• Left lower zone: dullness → left pleural effusion
• Liver dullness: reduced in cirrhosis; increased in hepatomegaly

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4. AUSCULTATION

• Bowel sounds: diminished/absent → ileus (severe pancreatitis); high-pitched/tinkling → obstruction
• Bruits: vascular bruits in epigastrium → pseudoaneurysm (rare but important)

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5. Special Tests to Mention in Examination

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6. Complete the Examination

• Rectal examination: melaena? (GI bleed from erosion)
• Groin: hernias? lymph nodes?
• Respiratory exam: pleural effusion (left side more common in pancreatitis)
• Nutrition assessment: muscle wasting, BMI

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SUMMARY: QUICK CLINICAL PICTURE TO REMEMBER

PATIENT PROFILE:
Middle-aged male (most common)
History of chronic alcohol use OR gallstones
Previous episode(s) of acute pancreatitis
Now presents 4-6 weeks later with:
  - Persistent or worsening epigastric pain
  - Nausea, anorexia, early satiety
  - Low-grade fever
  - Failure of serum amylase to normalize

ON EXAMINATION:
- May look cachectic (chronic pancreatitis)
- Scleral icterus (if bile duct compressed)
- Signs of alcoholism (palmar erythema, dupuytren's)
- Epigastric smooth rounded mass (the pseudocyst)
- Left basal dullness (pleural effusion if complicated)
- Rarely: Grey Turner's / Cullen's sign (hemorrhage)

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DIAGNOSTIC ALGORITHM (from Maingot's Abdominal Operations)

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• Maingot's Abdominal Operations (Diagnosis & Management of Pancreatic Pseudocyst)
• Rosen's Emergency Medicine (Chronic Pancreatitis - Clinical Features)
• Current Surgical Therapy 14e (Management of Pancreatic Pseudocyst)
• Sleisenger & Fordtran's GI & Liver Disease