Papilla Morphology - Haraldsson classification: useful for predicting whether a native papilla will be hard to cannulate
Type 1 (Regular):
 • Prevalence 56%, Cannulation Failure 2%, Difficult Cannulation 23%, Pancreatitis 8%
Type 2 (Small):
 • Prevalence 13%, Cannulation Failure 12%, Difficult Cannulation 11%, Pancreatitis 6%
Type 3 (Protruding):
 • Prevalence 23%, Cannulation Failure 11%, Difficult Cannulation 48%, Pancreatitis 43%
Type 4 (Creased/Ridged):
 • Prevalence 8%, Cannulation Failure 6%, Difficult Cannulation 2%, Pancreatitis 6%

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