Accuracy of magnetic resonance cholangiography compared to operative endoscopy in detecting biliary stones, a single center experience and review of literature

Table 1 Criteria for stratifying risk for choledocholithiasis

Age > 55 yr

Evidence/suspicion of calculi at US

Choledocus larger than 6 mm at US (in patients having gallbladder)

Conjugated bilirubin higher than 51 micromoles/L

Persistence of cholestasis 72 h after the acute episode

All criteria present: Biliary tree lithiasis probability > 90%

All but one criteria: Biliary tree lithiasis probability about 20%

US: Ultrasound.

Table 2 General features of magnetic resonance cholangiopancreatography performance on biliary stones detection

	ERCP+	ERCP-
MRCP+	102	0	PPV 100%
MRCP-	8	90	NPV 91.8%
	Sensitivity 92.7%	Specificity 100%	Accuracy 96%

MRCP: Magnetic resonance cholangiopancreatography; ERCP: Endoscopic retrograde cholangiopancreatography; PPV: Positive predictive value; NPV: Negative predictive value.

Table 3 Performance of magnetic resonance cholangiopancreatography on most common biliary diseases

Diagnosis	Sensitivity	Specificity	Accuracy	PPV	NPV
Choledocholithiasis	77.40%	100%	80.50%	100%	85%
Hepatobiliary/pancreatic stricture	100%	95%	57.50%	79%	100%

PPV: Positive predictive value; NPV: Negative predictive value.

Table 4 Previous studies data on magnetic resonance cholangiopancreatography as compared to the present study

Ref.	Sensitivity (%)	Specificity (%)	Accuracy (%)	PPV (%)	NPV (%)	Cohort numerosity
De Waele et al[17]	82.6	97.5	94.2	90.5	95.2	104 pts
Shanmugam et al[18]	97.98	84.4				374 pts
Moon et al[19]	80					32 pts
Kondo et al[20]	88					28 pts
Norero et al[21]	97	74	90	89	90	125 pts
Scaffidi et al[22]	88	72	83	87	72	140 pts
Li et al[23]	84.5	87.4				165 pts
Li et al[24]	64.09	80	66.27	95.27	26.17	255 pts
	80.411	79.411	69.231	94.441	48.211
Bilgin et al[13]	82.3	96	91.7			108 pts
Present study	100	95	57.5	100	85	200 pts

¹Microstones. PPV: Positive predictive value; NPV: Negative predictive value.