A 72-year-old woman from Delhi presents with 2 weeks of progressive jaundice, pruritus, and acholic (pale) stools. She has a 15-year history of recurrent cholangitis. On examination, temperature is 38.2°C, HR 96/min, BP 128/78 mmHg. Abdomen is soft, non-tender. Laboratory: total bilirubin 9.5 mg/dL (direct 7.8 mg/dL), ALP 410 U/L, GGT 350 U/L, AST 120 U/L, ALT 110 U/L, WBC 11,200/μL. Ultrasound shows intrahepatic bile duct dilatation with multiple echogenic foci within the dilated ducts and a normal-caliber extrahepatic bile duct. What is the most likely diagnosis and the most appropriate next step?

Explanation

## Clinical Diagnosis: Recurrent Pyogenic Cholangitis **Key Point:** The triad of (1) recurrent cholangitis, (2) intrahepatic bile duct dilatation with (3) echogenic foci (stones/debris) is pathognomonic for recurrent pyogenic cholangitis (RPC), also called Oriental cholangiohepatitis. **High-Yield:** Recurrent pyogenic cholangitis is endemic in East and Southeast Asia and presents with: - Recurrent episodes of cholangitis (fever, jaundice, RUQ pain) - Intrahepatic bile duct stones and strictures - Increased risk of cholangiocarcinoma (10–15%) - Normal or near-normal extrahepatic bile duct caliber (key distinguishing feature) ## Differential Diagnosis of Intrahepatic Bile Duct Dilatation | Diagnosis | Key Features | Imaging Hallmark | Next Step | |---|---|---|---| | **Recurrent Pyogenic Cholangitis** | Recurrent cholangitis, endemic area, stones in intrahepatic ducts | Intrahepatic dilatation + stones, normal CBD | MRCP for ductal anatomy | | Choledocholithiasis | Acute presentation, stone in CBD | Stone in extrahepatic duct | ERCP + sphincterotomy | | Intrahepatic cholangiocarcinoma | Painless jaundice, no fever, progressive | Irregular stricture, mass | CT + EUS | | Primary sclerosing cholangitis | Inflammatory bowel disease, progressive jaundice | Beads-on-string appearance | Liver biopsy | ## Why MRCP Is the Correct Next Step **Clinical Pearl:** In recurrent pyogenic cholangitis, MRCP is essential to: 1. **Map the ductal anatomy** — identify strictures, stones, and areas of dilatation 2. **Assess intrahepatic involvement** — determine which segments are affected (guides surgical planning) 3. **Screen for cholangiocarcinoma** — look for irregular strictures or mass lesions 4. **Guide therapeutic intervention** — percutaneous transhepatic cholangiography (PTC) with stone extraction or surgical hepatic resection if indicated **Mnemonic: RPC Features — IHBD-S** - **I**ntrahepatic bile duct dilatation - **H**istory of recurrent cholangitis - **B**eads-on-string appearance (strictures) - **D**ebris/stones in ducts - **S**outheast Asian origin (endemic) ```mermaid flowchart TD A[Recurrent cholangitis + IHBD dilatation + stones]:::outcome --> B{Extrahepatic duct caliber?}:::decision B -->|Normal/narrow| C[Recurrent pyogenic cholangitis]:::outcome B -->|Dilated| D[Choledocholithiasis or malignancy]:::outcome C --> E[MRCP for ductal mapping]:::action E --> F{Complications present?}:::decision F -->|Strictures/stones only| G[PTC with stone extraction]:::action F -->|Cholangiocarcinoma suspected| H[EUS + CT staging]:::action F -->|Recurrent infections| I[Hepatic resection consideration]:::action ``` **Warning:** Do NOT perform ERCP in RPC without prior imaging — the ducts are often tortuous and strictured, making cannulation difficult and risking perforation. PTC is often preferred.