Select the Csendes type to visualize the surgical anatomical profile.
Guidelines & Evidence
Clinical Details
Section 1
When to Use
When to Use
Pre-operative or intra-operative classification of biliary obstruction caused by an impacted gallstone in the cystic duct or gallbladder neck
To guide surgical planning (Laparoscopic vs. Open vs. Complex Reconstruction)
Evaluating the risk of a cholecystobiliary fistula (CBF)
Clinical Presentation
Typically presents with jaundice, fever, and right upper quadrant pain (Charcot's triad) in the setting of chronic cholecystitis, mimicking choledocholithiasis.
Section 2
Formula & Logic
Csendes Classification (Types I–V)
01
Type I: External compression of the CHD by an impacted stone (No fistula).
02
Type II: Cholecystobiliary fistula involving < 1/3 of the CHD circumference.
03
Type III: Fistula involving 1/3 to 2/3 of the CHD circumference.
04
Type IV: Complete destruction of the CHD wall (Total fistula).
05
Type V: Any type (I–IV) plus a cholecystoenteric fistula (usually cholecystoduodenal).
Surgical Guidance
Type I
Partial/Total Cholecystectomy (Lap or Open)
Type II
Partial Cholecystectomy + Suture of fistula (T-tube)
Mirizzi syndrome is one of the highest-risk conditions for biliary duct injury during laparoscopic cholecystectomy. The dense inflammation often obscures the "Critical View of Safety." Detection of Type II–IV often mandates conversion to an open procedure to ensure anatomical clarity.
Pre-operative Detection
MRI/MRCP or EUS are the most sensitive non-invasive modalities for detecting the "impacted stone" and identifying the level of obstruction. ERCP is the gold standard for defining the fistula (type II-IV) pre-operatively.
Clinical Pearls
Mirizzi syndrome is rare (found in ~1% of all cholecystectomies)
Highly associated with gallbladder carcinoma (up to 5%–25% in some series) — intraoperative frozen sections are often recommended
Low cystic duct insertion (parallel to CHD) is a major anatomical predisposing factor
Section 4
Next Steps
Diagnostic Pathway
01
Suspected Mirizzi: Order MRCP to rule out common duct stone.
02
Identified Type II-IV: Consult an experienced hepatobiliary surgeon for definitive Roux-en-Y planning.
03
Surgery Complete: Monitor for late biliary strictures.
Complementary Biliary Tools
ASGE Choledocholithiasis Risk
Tokyo Guidelines for Cholecystitis
Strasberg Classification (Bile Duct Injury)
Section 5
Evidence Appraisal
The Modern Classification
Mirizzi syndrome and cholecystobiliary fistula: a unifying classification.
Csendes A et al. • British Journal of Surgery. 1989;76(11):1139-43. The foundational paper defining types I-IV.
Named after the Argentinian surgeon Pablo Luis Mirizzi, who first described the phenomenon in 1948. Attis Csendes later formalized the classification based on his extensive surgical experience in Chile (a region with high rates of complex gallstone disease).
