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MRCP Vs. ERCP
Concept: What's New Might Be Good?
As with all in medicine, and especially in fields such as
gastroenterology and hepatology, advances in both technology and
pharmacology are ever changing. With these new advances comes the
process of deciding what is truly added value with respect to both
diagnosis and therapeutics, and what is just a mere blip on the radar
field in the advances of medicine.
What follows is an instance of a reported new diagnostic techniques,
which may have an impact on what we do both in a diagnostic and
therapeutic approach to GI disease of the hepato - biliary system
MRCP: Magnetic Radiologic Cholangiogram
MRCP is a new application of a know form of body imaging known as
MRI. With this technique, a patient's Hepato-Biliary & Pancreatic
system is imaged using a MRI unit, and utilizing special software, an
image similar to a cholangiogram and / or a pancreatogram is
obtained. This type of imaging can reproduce images very similar as
those obtained from the more invasive approach with ERCP (Endoscopic
Retrograde Cholanigiopancreatography) without the added risk of
pancreatitis, sedation, and perforation.
The downside at present is physician interpretation of the films, and
the relative new application of this software in institutions not
familiar with it.
In addition, all that MRCP allows is an image, not a curative
possibility, and hence the problem that faces the consultant
gastroenterologist/hepatologist.
When and whom to use this new imaging technique?
In patients with highly suspected pathology in which therapeutic ERCP
may have value, there is little value in obtaining an MRCP. Such
patients that would benefited from ERCP would include:
Patients with obstructive jaundice in which ultrasound or CT scan
suggests biliary dilatation from either a stone or a mass, where
therapeutic remedies such as stone removal or stent placement with
cytology aspiration could aid in diagnosis and in improvements in
symptoms.
Biliary dyskensia in which patients with post cholecystectomy pain
syndromes are being considered for sphincter of oddi manometry
Recurrent idiopathic pancreatitis in which patients are being
considered for pancreatic/common bile duct manometry
Patients with Pseudocysts in which attempts at endoscopic drainage
with either stents or trans-gastric cyst-gastosotomy are considered
Post-Cholecystectomy bile leaks or surgical bile duct injuries, in
which stenting of the bile duct or dilatation of strictures can occur
with ERCP
Examples where MRCP may have added value are in patients with a low
probability of correctable pathology as provided with therapeutic
ERCP such as:
Patients with elevated Liver Function test which have no evidence of
hepato-biliary ductal dilatation on abdominal ultrasound nor CT in
which the risks of ERCP are especially high. These patients would
include those with compromised cardiopulmonary function, patients
with known problems with conscious sedation.
Patients with unexplained abdominal pain in whom a low probability
of hepato-biliary pathology such as retained common bile duct
stones, cancer, biliary dyskensia, or idiopathic pancreatitis is
suspected by both clinical presentation and previous imaging such as
CT and ultrasound.
Patients with jaundice where there is no evidence of ductal
dilatation by US nor CT but CBD dilatation needs to be ruled out.
As with all new technology, the role of MRCP is still to be defined.
Within Jacksonville, MRCP is available, but at present, its use is
best with those of its attributes and pitfalls when ordering it.
Article By: Kyle Peter Etzkorn, M.D., F.A.C.P.
Current Medical Literature:
The value of magnetic resonance tomography (MRT), magnetic resonance
cholangiopancreatography (MRCP) and endoscopic retrograde
cholangiopancreatography (ERCP) in the diagnosis of pancreatic tumors
Diehl SJ , Lehmann KJ , Gaa J , Meier-Willersen HJ , Wendl K , Georgi
M
Rofo Fortschr Geb Rontgenstr Neuen Bildgeb Verfahr 1999 May;170
(5):463-9
To prospectively evaluate the role of MRI including MR
cholangiopancreatography (MRCP) compared to endoscopic retrograde
cholangiopancreatography (ERCP) in the diagnosis of pancreatic
cancer. MATERIAL AND METHODS: ERCP and MRI including MRCP were
performed in 52 patients with suspected pancreatic cancer. MRCP was
obtained using a single-shot RARE technique. The results of axial
images and MRCP were compared to concurrently performed ERCP
examinations. The standards of reference were the surgical and
pathological findings, respectively. Image quality of MRCP was
assessed using a three-step-score (1 = good, 2 = fair, 3 =
nondiagnostic). RESULTS: In 88% of the cases the MRCP was of good
quality. Only in 4% was MRCP non-diagnostic. The combination of MRI
and MRCP showed an overall accuracy of 88%, whereas the overall
accuracies of MRCP alone and ERCP were 80%, and 85%, respectively.
The positive predictive values of MRI/MRCP, MRCP alone, and ERCP were
91%, 85%, and 88%, respectively. CONCLUSION: For the detection of
pancreatic cancer MRI including MRCP is comparable to ERCP and can be
regarded as the method of choice in patients with suspected
pancreatic cancer. ERCP is the procedure of choice in patients with
contraindications to MRI and in patients in whom additional
therapeutic procedures are performed.
Diagnostic usefulness of magnetic resonance cholangiopancreatography
(MRCP) in comparison with retrograde cholangiopancreatography (ERCP)
for Cholelithiasis Ahn T , Matsumoto M , Ueda S , Fukui H
Nippon Rinsho 1998 Nov;56(11):2923-7
To elucidate MRCP diagnostic usefulness compared to ERCP. PATIENTS,
METHODS: 29 MRCP performed patients diagnosed by ERCP were studied.
RESULTS: MRCP showed 92%, 67% sensitivity and 73%, 100% specificity
in choledocholithiasis (CBD) and cholecystolithiasis (GB),
respectively. MRCP revealed 4.0 false positive and 1.5 false negative
in CBD and GB, respectively. MRCP could detect 22 stones out of 33 in
CBD and 13 out of 42 in GB. As for the maximal diameter, MRCP
depicted 31% for less than 5 mm and 100% for over 6 mm in CBD. In GB,
7% for less than 5 mm, 83% for 6-10 mm and 100% for over 11 mm.
CONCLUSION: Although the depiction of tiny stone is limited, MRCP is
a useful diagnostic tool for cholelithiasis, especially
choledocholithiasis.
Can MRCP replace ERCP?
Takehara Y Department of Radiology, J Magn Reson Imaging 1998 May-
Jun;8(3):517-34
Magnetic resonance cholangiopancreatography (MRCP) has replaced
direct cholangiography and pancreatography in many instances. Its
complete noninvasiveness and flexibility are less onerous for
patients. For the use of screening as well as scrutiny, MRCP has
played an important role in diagnosing various pathologies in this
field. The usefulness of MRCP is not limited to anatomical
evaluations; it can also yield physiologic and functional
information. From a cost-performance basis, MRCP is undoubtedly
superior to direct methods. Coupled with a cutting-edge MR system,
MRCP has the potential to limit the use of invasive transpapillary
and percutaneous methods merely to interventional purposes. In the
near future, the emergence of interventional MR scanners will make
MRCP even more competitive, and the replacement will be accelerated.
Comparison of endoscopic retrograde cholangiopancreatography with MR
cholangiopancreatography in patients with pancreatitis. Sica GT ,
Braver J , Cooney MJ , Miller FH , Chai JL , Radiology 1999 Mar;210
(3):605-10To assess the usefulness of magnetic resonance (MR)
cholangiopancreatography (MRCP) in the evaluation of disease in
patients with acute or chronic pancreatitis. MATERIALS AND METHODS:
MR imaging was performed at 1.5 T in 39 patients with chronic (n =
30) or acute (n = 9) pancreatitis. The patients underwent a pancreas
MR imaging protocol that included an MRCP sequence. Comparison was
made with findings at endoscopic retrograde cholangiopancreatography
(ERCP), performed within 30 days. Three blinded readers used a
scoring system to evaluate nine segments of the pancreatic and
biliary ducts as depicted on the ERCP and MRCP images. MRCP image
quality was also evaluated. RESULTS: Of 196 segments analyzed, 17
were not seen at MRCP (sensitivity, 91%). Of the segments visualized
at MRCP, 14 were incorrectly characterized (accuracy, 92%). At MRCP,
segments not detected or mischaracterized were either normal,
slightly dilated, or narrowed. At ERCP, 42 segments in 19 patients
were not visualized. MRCP findings were considered useful in all
those cases. MRCP image quality was not interpretable in two cases
due to artifacts. CONCLUSION: Very good correlation between ERCP and
MRCP findings was demonstrated. Both modalities failed to depict
pathologic conditions depicted by the alternative method. MRCP may
obviate ERCP, particularly in patients who cannot undergo ERCP or in
whom ERCP has been unsuccessful.
Comparison of endoscopic retrograde and magnetic resonance
cholangiopancreatography in the surgical diagnosis of pancreatic
diseases. Yamaguchi K , Chijiwa K , Shimizu S , Yokohata K , Morisaki
T ,
Am J Surg 1998 Mar;175(3):203-8 Magnetic resonance
cholangiopancreatography (MRCP) is a newly developing noninvasive
examination of the biliopancreatic trees. Roles of MRCP in the
diagnosis of pancreatic diseases have not been scrutinized. METHODS:
Endoscopic retrograde cholangiopancreatography (ERCP) and MRCP were
reviewed in 52 Japanese patients with various pancreatic diseases and
6 patients with normal pancreas to compare their diagnostic
usefulness and limitation. RESULTS: In those with normal pancreas,
only the main pancreatic duct was visualized by MRCP, while both the
main pancreatic and branch ducts were clearly delineated by ERCP. In
3 patients with serous cystadenoma, the tumor was not visualized by
ERCP, whereas it was visible as a high-intensity mass on MRCP. Of 18
patients with a "mucin hypersecreting" tumor of the branch type, MRCP
demonstrated cystically dilated branch ducts in all, while ERCP
failed to visualize the dilated ducts in 6 patients. However, the
details of the cystic lesions (mural nodule, communication with the
main pancreatic duct) were more exactly demonstrated by ERCP than
MRCP. In 5 patients with a mucin hypersecreting tumor of the main
pancreatic duct type, the dilated main pancreatic duct and the
presence of mural nodules were similarly demonstrated both by ERCP
and MRCP. In 12 patients with pancreatic adenocarcinoma, indirect
findings were similarly demonstrated both by ERCP and MRCP, ie,
stenosis (4 patients) and obstruction (8) together with dilation of
the main pancreatic duct (9). In 3 patients, the center of the mass
showed high intensity on MRCP, suggesting the secondary change of
pancreatic carcinoma. In 8 patients with obstruction of the main
pancreatic duct due to carcinoma, the distal pancreatic duct was
visualized by MRCP but not by ERCP. In 9 patients who had undergone
pylorus-preserving or standard pancreatoduodenectomy, follow-up MRCP
was obtainable in all examined and displayed the main pancreatic
duct. CONCLUSIONS: MRCP plays a complementary role in the surgical
diagnosis of pancreatic disorders and is especially useful to examine
the pancreatic duct after pancreatoduodenectomy.
Magnetic resonance cholangiopancreatography accurately predicts the
presence or absence of choledocholithiasis. Hochwalk SN , Dobryansky
M BA , Rofsky NM , Naik KS , Shamamian P , Coppa G , Marcus SG J
Gastrointest Surg 1998 Nov-Dec;2(6):573-9
Accurate common bile duct (CBD) imaging in patients with biliary
calculi is an important determinant of specific therapy. Noninvasive
methods to evaluate calculi in the CBD have limited accuracy and rely
mainly on ultrasonography and computed tomography. Magnetic resonance
cholangiopancreatography (MRCP) is a new noninvasive modality
available to evaluate the biliary system. This study was undertaken
to assess the accuracy of MRCP in predicting the presence or absence
of CBD stones in patients at increased risk for choledocholithiasis.
The medical records of 48 patients with a final diagnosis of biliary
calculous disease undergoing MRCP between November 1995 and April
1997 were retrospectively reviewed. Three groups were identified:
choledocholithiasis (n = 19), gallstone pancreatitis (n 5 11), and
uncomplicated cholelithiasis (n = 18). In all patients the presence
or absence of CBD calculi, as determined by MRCP, was correlated with
the final diagnosis obtained from endoscopic retrograde
cholangiopancreatography (ERCP) (n = 19), intraoperative
cholangiography (n = 6), CBD exploration (n = 13), or clinical follow-
up (n = 10). Sensitivity, specificity, and accuracy of MRCP were
determined. The major clinical indications for MRCP in the 48
patients ware abnormal liver function tests followed by
hyperamylasemia. Twenty patients were diagnosed with CBD stones and
28 were not. MRCP correctly predicted the presence of CBD stones in
19 of 20 patients and failed to detect CBD stones in one patient with
gallstone pancreatitis. MRCP incorrectly predicted the presence of
CBD stones in 3 of 28 patients ultimately found to have gallstones
and no CBD stones. MRCP correctly predicted the absence of CBD stones
in the other 25 patients including 10 patients with gallstone
pancreatitis. Overall, MRCP had a sensitivity of 95%, a specificity
of 89%, and an accuracy of 92%. MRCP is an accurate, noninvasive test
for evaluating the CBD duct for the presence or absence of calculi in
patients suspected of having CBD stones. Our data support the use of
MRCP in the preoperative evaluation of these patients as findings may
influence therapeutic decisions.
A prospective evaluation of magnetic resonance
cholangiopancreatography in patients with suspected bile duct
obstruction Adamek HE , Albert J , Weitz M , Breer H , Schilling D ,
Riemann JF. Gut 1998 Nov;43(5):680-3 The value of magnetic resonance
cholangiopancreatography (MRCP) is under debate. AIMS: To assess the
diagnostic accuracy of MRCP and endoscopic retrograde
cholangiopancreatography (ERCP) and to determine whether MRCP may
help to prevent unnecessary interventional procedures. METHODS:
Eighty six patients with suspected common bile duct obstruction who
presented between January and December 1996 were enrolled. Twenty six
were excluded due to anatomical reasons or because MRCP or ERCP could
not be performed successfully. Results of MRCP were interpreted by
two radiologists and a gastroenterologist unaware of clinical
diagnosis. Final diagnosis was determined by ERCP and
histopathological findings or a follow up of at least 12 months.
RESULTS: MRCP images of diagnostic quality were obtained in all 60
patients. Thirteen patients had a clear bile duct. Sensitivity and
specificity for the detection of any abnormality (n=47) were 89% and
92%, and for the detection of malignancy (n=27) 81% and 100%,
respectively. These results were equivalent to the respective figures
of ERCP (91% and 92% for any abnormality, and 93% and 94% for
malignant diseases). CONCLUSIONS: MRCP is as sensitive as ERCP in the
evaluation of biliary tract diseases. As the specificity of this non-
invasive technique is close to 100%, MRCP may prevent inappropriate
invasive explorations of the common bile duct and pancreatic duct.
Value of magnetic resonance cholangiopancreatography in demonstrating
major bile duct injuries following laparoscopic cholecystectomy. Yeh
TS , Jan YY , Tseng JH , Hwang TL , Jeng LB ,Chen MF
Br J Surg 1999 Feb;86(2):181-4 Conventionally, recognition of bile
duct injuries after laparoscopic cholecystectomy largely relies on
endoscopic retrograde cholangiopancreatography (ERCP) and
percutaneous transhepatic cholangiography (PTC). However, these
invasive procedures are not without risk. Preliminary experience with
use of magnetic resonance cholangiopancreatography (MRCP) to identify
these injuries is reported. METHODS: The medical records of five
patients who had undergone laparoscopic cholecystectomy and had
suspected major bile duct injuries were reviewed. All five patients
underwent MRCP, followed by conventional cholangiography: either ERCP
or PTC, or both. The findings of MRCP and conventional
cholangiography were compared. RESULTS: Four patients had proven bile
duct injuries. The remaining patient had gallstones dislodged into
the common bile duct (CBD) during laparoscopic cholecystectomy, which
presented as transient jaundice mimicking a bile duct injury. The
MRCP images were of higher diagnostic value than conventional
cholangiographic images in four patients with frank bile duct injury.
For these patients, ERCP showed only the cut-off sign of the CBD, and
PTC was needed to visualize the upper biliary system. MRCP, however,
demonstrated the entire biliary system proximal and distal to the
amputated or stenotic sites simultaneously. In the remaining patient
with dislodged gallstones, the two techniques yielded similar
diagnostic information. CONCLUSION: This preliminary study suggests
that MRCP is an ideal diagnostic test whenever bile duct injury
following laparoscopic cholecystectomy is suspected.
MR cholangiography: techniques and clinical applications. Pavone P ,
Laghi A , Panebianco V , Catalano C Eur Radiol 1998;8(6):901-10
Magnetic resonance cholangiography (MRCP) is a new non-invasive
imaging technique for the evaluation of bilio-pancreatic disorders.
Different sequences, using both breathhold and non-breathhold
techniques, have been employed in order to obtain MRCP images. The
authors discuss the technical aspects, particularly focusing their
attention on a non-breathhold, three-dimensional, fat-suppressed
turbo-spin-echo sequence, optimized on a 0.5-T magnet with 15 mT/m
gradients. Clinical applications of MRCP are evaluated, presenting
data from both the literature and personal experience. The main
indication for MRCP study is represented by the evaluation of common
bile duct obstruction, with the aim of assessing the presence of the
obstruction (accuracy 85-100 %) and, subsequently, its level
(accuracy 91-100 %) and its cause. The utility of associating
conventional MR images to MRCP in malignant strictures in order to
characterize and stage the malignant lesions is also discussed.
Finally, data are presented regarding the indications and utility of
MR pancreatography in the evaluation of patients with chronic
pancreatitis.
Comparison of magnetic resonance and endoscopic retrograde
cholangiopancreatography in malignant pancreaticobiliary obstruction.
Georgopoulos SK , Schwartz LH , Jarnagin WR , Gerdes H , Breite I
Arch Surg 1999 Sep;134(9):1002-7 We hypothesize that magnetic
resonance cholangiopancreatography (MRCP) is comparable to endoscopic
retrograde cholangiopancreatographic (ERCP) as a diagnostic tool in
patients with malignant biliary obstruction. DESIGN: Eighteen
patients with suspected pancreaticobiliary malignancy were evaluated
by ERCP and MRCP in 8 months (March 1, 1996, to October 31, 1996).
Magnetic resonance cholangiopancreatography was performed with a 1.5-
T scanner using 4-mm slices. Images were obtained in a 14- to 28-
second breath-hold. Images from MRCP were retrospectively evaluated
by a radiologist for image quality, ductal dilation, level of
obstruction, and overall diagnostic impression. Images from ERCP were
retrospectively evaluated by a biliary endoscopist (L.H.S.) and
served as the standard for calculating sensitivity, specificity, and
positive predictive values. In addition, intraoperative findings were
compared with MRCP results in all patients explored. RESULTS:
Diagnostic-quality MR images were obtained in 18 patients (100%).
Diagnostic-quality endoscopic images were obtained in 16 (89%) of 18
attempted biliary cannulations and 11 (78%) of 14 attempted
pancreatic cannulations. Magnetic resonance CP accurately delineated
the level of extrahepatic biliary ductal obstruction in 13 (87%) of
15 patients. More important, MRCP provided valuable staging
information in most patients. Findings from MRCP correlated with
operative findings (size and location of tumor and mesenteric
vascular involvement) in 8 (80%) of 10 patients who underwent
surgery, while failing in 2 patients (20%) with carcinomatosis.
CONCLUSIONS: Magnetic resonance CP is a sensitive study for detecting
the presence and level of biliary ductal obstruction in patients with
cancer. The results are comparable to those of ERCP; however, MRCP
provides additional data regarding extent of disease that is not
available from ERCP alone.
A prospective comparison of magnetic resonance
cholangiopancreatography with endoscopic retrograde
cholangiopancreatography in the evaluation of patients with suspected
biliary tract disease.
Varghese JC , Farrell MA , Courtney G , Osborne H , Murray FE
Clin Radiol 1999 Aug;54(8):513-20 To determine the diagnostic
accuracy of magnetic resonance cholangiopancreatography (MRCP)
compared with direct cholangiography in the detection of biliary
tract disease. PATIENTS AND METHODS: MRCP was performed in 100
patients in whom direct cholangiographic correlation (ERCP, n = 98;
PTC, n = 9; intraoperative cholangiography, n = 3) was available for
comparison. The MRCP examinations were performed using a two-
dimensional multi-slice, fast spin echo (FSE) technique and a local
surface coil. The diagnoses at direct cholangiography were
choledocholithiasis in 30 patients, benign and malignant strictures
in 28 patients and normal bile ducts in 42 patients. The nature of
the strictures (benign, n = 2; tumor, n = 18; lymphnode recurrence, n
= 3; unknown histology, n = 5) was determined by one or more of the
following procedures: surgery (n = 8), biopsy (n = 15), cytology (n =
6) and cross-sectional imaging/follow-up findings (n = 3). RESULTS:
MRCP diagnosed choledocholithiasis with a sensitivity of 93%,
specificity of 99% and accuracy of 97 %. It resulted in two false-
negative and one false-positive findings when compared with direct
cholangiography. MRCP accurately diagnosed the presence and level of
strictures in all patients. The overall sensitivity, specificity and
accuracy of MRCP in the detection of bile duct lesions were 97%, 98%
and 97%, respectively. CONCLUSION: MRCP has a high diagnostic
accuracy when compared with direct cholangiography in the detection
of bile duct disease.