What are the steps of pancreatoscopy?

Pancreatoscopy Procedural Steps

Pancreatoscopy is performed using a mother-baby endoscope system inserted through the pancreatic duct after pancreatic sphincterotomy, with the procedure requiring pre-procedural imaging, prophylactic antibiotics, and typically a 19-gauge needle for EUS-guided access when needed.

Pre-Procedural Preparation

Before attempting pancreatoscopy, obtain MRCP or contrast-enhanced CT to understand pancreatic duct anatomy, identify the optimal puncture site, assess for interposed vasculature, and plan the approach 1. This imaging is critical for selecting the location with the shortest distance between bowel lumen and pancreatic duct.

Administer prophylactic antibiotics covering biliary flora (second-generation cephalosporin or quinolone) to prevent bacterial dissemination 1.

Access and Cannulation

Standard Transpapillary Approach

1. Perform ERCP with pancreatic sphincterotomy - This is mandatory before inserting the pancreatoscope, as the sphincter must be dilated to accommodate the scope (typically 3.2-4.5 mm diameter) 2, 3

2. Alternative: Endoscopic sphincter dilation (ESD) - Use an Olbert balloon-tipped catheter to dilate the papillary orifice if sphincterotomy is not preferred 4

3. Insert the mother duodenoscope to the major papilla and cannulate the main pancreatic duct

EUS-Guided Approach (for altered anatomy)

1. Puncture the pancreatic duct with a 19-gauge needle under EUS guidance 1

2. Insert a 0.035-inch or 0.025-inch guidewire with floppy tip through the needle to negotiate the pancreatic duct and papilla 1

3. Select approach based on anatomy: transgastric (most flexible), transduodenal, or transjejunal 1

Scope Insertion and Examination

1. Insert the baby pancreatoscope through the accessory channel of the therapeutic duodenoscope after adequate sphincterotomy/dilation 3

2. Advance the scope smoothly into the main pancreatic duct under direct visualization

3. Systematically examine the pancreatic duct mucosa looking for:

   • Fish-egg-like lesions (salmon-roe appearance) characteristic of IPMN 4, 5
   • Hypervascularity and granular mucosa 5
   • Strictures requiring differentiation between benign and malignant 3
   • Stones requiring lithotripsy 6

Therapeutic Interventions (When Indicated)

For stones <5mm: Perform conventional stone extraction during the same session 6

For stones ≥5mm: Use pancreatoscopy-guided intraductal lithotripsy (electrohydraulic or laser) 6, 7. The 2023 prospective multicenter trial demonstrated 90% complete stone clearance with DSOP-guided lithotripsy in a mean of 1.36 interventions 7.

For tissue sampling: Use biopsy forceps through the working channel, though maneuverability is limited in pancreatic ducts 3

Post-Procedural Management

Place a prophylactic pancreatic stent to reduce the risk of post-ERCP pancreatitis, which occurs in approximately 10% of cases 5. Consider prophylactic NSAIDs as well.

Key Technical Considerations

The cannulation and observation rates are consistently high across studies, with overall diagnostic accuracy being excellent 5. However, the procedure requires specialized equipment and trained personnel 8.

Common pitfalls to avoid:

• Attempting pancreatoscopy without adequate sphincterotomy leads to failed insertion
• Inadequate pre-procedural imaging results in suboptimal approach selection
• Omitting prophylactic antibiotics increases infection risk
• Failure to place prophylactic pancreatic stent increases pancreatitis risk (pooled rate 10%) 5

The overall adverse event rate is 12%, primarily post-ERCP pancreatitis of mostly mild severity 5. Self-limited abdominal pain is also common 8.