A 58-year-old man presents with painless progressive jaundice for 3 weeks, pale stools, and dark urine. On examination, he has hepatomegaly and a palpable gallbladder. Serum bilirubin is 8.2 mg/dL (direct 6.8 mg/dL), alkaline phosphatase 320 IU/L, and ALT 85 IU/L. Abdominal ultrasound shows dilated intrahepatic and extrahepatic bile ducts with a hypoechoic lesion in the pancreatic head. What is the most appropriate next step in management?

Explanation

## Clinical Context This patient presents with **Courvoisier's sign** (painless jaundice + palpable gallbladder), which is highly suggestive of **pancreatic head carcinoma** causing biliary obstruction. The imaging findings (dilated ducts + pancreatic head lesion) confirm obstruction at the pancreatic level. ## Diagnostic Algorithm for Obstructive Jaundice ```mermaid flowchart TD A[Obstructive Jaundice]:::outcome --> B[Ultrasound]:::action B --> C{Dilated ducts + Pancreatic lesion?}:::decision C -->|Yes| D[Suspect pancreatic malignancy]:::outcome D --> E[CT abdomen/pelvis with contrast]:::action E --> F{Resectable?}:::decision F -->|Yes| G[Surgical resection]:::action F -->|No| H[Palliative biliary drainage]:::action C -->|No| I[Consider choledocholithiasis/cholangitis]:::outcome I --> J[ERCP ± sphincterotomy]:::action ``` ## Why CT Is the Next Step **Key Point:** In suspected **pancreatic malignancy**, CT with IV contrast is mandatory BEFORE any intervention to: 1. **Confirm diagnosis** — characterize the lesion 2. **Assess resectability** — evaluate vascular involvement (superior mesenteric artery/vein, portal vein) 3. **Stage disease** — detect metastases (liver, peritoneum, distant nodes) 4. **Plan treatment** — determine candidacy for curative resection vs. palliative bypass **High-Yield:** ERCP is NOT first-line for suspected malignant obstruction because: - It does not provide staging information - Stent placement may delay definitive surgery - Risk of pancreatitis and cholangitis if malignancy is later confirmed - Stent migration and occlusion are common in malignant strictures **Clinical Pearl:** Courvoisier's sign (painless jaundice + palpable gallbladder) has >90% specificity for malignant obstruction, not gallstones. Gallstone disease typically causes pain and a contracted, fibrotic gallbladder. ## Management Sequence 1. **CT imaging** (current step) — assess resectability and staging 2. **Surgical consultation** — if resectable, proceed to pancreaticoduodenectomy 3. **Palliative drainage** (ERCP or PTC) — only if unresectable or high operative risk [cite:Sabiston Textbook of Surgery Ch 56]