Pancreatic Divisum

I. Definition and Epidemiology

• Pancreatic Divisum is the most common congenital anomaly of the pancreas.
• Occurs in approximately 7–10% of the general population.
• Results from failure of fusion between the ventral and dorsal pancreatic ducts during embryologic development (around week 7–8 of gestation).

II. Types of Pancreatic Divisum

• Complete (Classic) PD:
  • Dorsal duct (duct of Santorini) drains the majority of the pancreas (body, tail, superior head) through the minor papilla.
  • Ventral duct (duct of Wirsung) drains a small portion through the major papilla.
• Incomplete PD:
  • A small accessory communication exists between the dorsal and ventral ducts.
  • Partial drainage may occur through both papillae.

III. Pathophysiology and Clinical Significance

• Most individuals are asymptomatic (>95%).
• In a minority, PD may contribute to:
  • Recurrent acute pancreatitis (RAP)
  • Chronic pancreatitis (CP)
  • Chronic abdominal pain (CAP)
• Proposed mechanism:
  • Drainage through the smaller minor papilla may be insufficient for high-volume flow.
  • Leads to ductal hypertension, papillary inflammation, stenosis, and enzyme activation.

IV. Clinical Presentation

• Often asymptomatic.
• When symptomatic:
  • Intermittent or persistent upper abdominal pain
  • Recurrent episodes of pancreatitis
  • Nausea, vomiting, postprandial discomfort
  • In severe cases: weight loss, steatorrhea, pancreatic insufficiency

V. Diagnostic Evaluation

• Imaging Studies:
  • CT Scan / MRI: ductal dilation, atrophy, calcifications
  • MRCP (Magnetic Resonance Cholangiopancreatography): preferred non-invasive method
  • Secretin-enhanced MRCP: improves visualization of ductal drainage
• ERCP (Endoscopic Retrograde Cholangiopancreatography):
  • Historically used for diagnosis and therapy
  • Now reserved for therapeutic intervention due to procedural risks

VI. Management and Treatment

• Asymptomatic patients: No treatment required.
• Symptomatic patients:
  • Endoscopic therapy:
    • Minor papilla sphincterotomy
    • Stent placement
    • Balloon dilation
  • Surgical options:
    • Sphincteroplasty
    • Pancreaticojejunostomy (in refractory cases)
  • Conservative management:
    • Low-fat diet
    • Analgesics
    • Pancreatic enzyme supplements

VII. Prognosis

• Most individuals live without complications.
• In symptomatic cases, endoscopic or surgical intervention can reduce pancreatitis episodes and improve quality of life.